vendredi 31 décembre 2021

Alzheimer's Drug Aduhelm Faces Crucial Medicare Decision

Medicare officials are trying to determine whether to cover Aduhelm, which the F.D.A. approved despite unclear evidence that it helps patients.

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Omicron Doesn't Infect the Lungs Very Well, Animal Studies Find

Compared with earlier variants, Omicron may cause less damage to the lungs, new animal research suggests.

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F.D.A. Plans to Allow 12- to 15-Year-Olds to Receive Pfizer Boosters

Regulators are also expected to allow even younger children with immune deficiencies to get an extra shot.

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The Plane is Boarding, Where Are Your Test Results?

International travelers in search of Covid-19 tests are scrambling to find sites that can get them results before their flights take off — and sometimes failing.

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jeudi 30 décembre 2021

J. & J. Booster Protects Against Severe Omicron, Study Says

Two shots of the vaccine reduced the risk of hospitalization from the fast-spreading variant by 85 percent, a clinical trial found.

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At-Home Covid Tests Raise Questions About Accurately Counting Cases

Most of the results of rapid tests are not reported. That’s magnifying questions about how best to measure the spread of the virus.

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mercredi 29 décembre 2021

Federal Officials Say Early Omicron Data Suggests a Less Deadly Wave

Dr. Rochelle P. Walensky and Dr. Anthony S. Fauci cautioned that hospitalizations and deaths could be lagging behind case counts.

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As Omicron Spreads, Officials Ponder What It Means to Be ‘Fully Vaccinated’

The contagious new variant has companies and government officials wondering whether Americans can really be considered vaccinated without booster shots.

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The Year in Fitness: Shorter Workouts, Greater Clarity, Longer Lives

The most vital exercise science of 2021 provided a reminder that our bodies and minds can flourish, no matter our circumstances.

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mardi 28 décembre 2021

Will Shortened Isolation Periods Without Testing Spread the Virus?

Without rapid testing, some experts fear new U.S. guidelines may mean infected people leave isolation while still contagious. The C.D.C. director said masking was a better option.

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Despite Rising Hospitalizations, Omicron Is Not Worse for Children

More children are being treated for Covid, but a combination of factors, including low vaccination rates, most likely explains the increase.

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Omicron Variant May Help Beat Delta, Study Suggests

In the lab, antibodies produced during an Omicron infection protected against Delta. If Omicron dominates in the real world, that could lead to a less dire future.

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Neil Marcus, Whose Art Illuminated Disability, Dies at 67

A playwright and actor, he saw his life as performance art. He was best known for his play “Storm Reading.”

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Why Is My Eyelid Twitching? Questions and Answers

And how do I get it to stop?

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Why Is My Eyelid Twitching?

And how do I get it to stop?

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Sickle Cell Math Is Brutally Simple, but Not Widely Taught

An inexpensive blood test can warn couples if they face one in four odds of having a baby with the disease. No one ever told Lametra Scott and Rickey Buggs about it.

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lundi 27 décembre 2021

As Omicron Cases Surge, CDC Shortens Isolation Times for Many Americans

Hoping to prevent further disruptions to daily life, the C.D.C. reduced the period that certain infected Americans must sequester.

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Jury in Holmes Trial Set to Deliberate for Fourth Day

A jury of eight men and four women deliberated for three days last week with no verdict in the case of the Theranos founder.

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Many Common Medications Can Raise Your Blood Pressure

Popular pain relievers and antidepressants, as well as alcohol and herbal supplements, are among the many substances that can contribute to hypertension.

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How Disgust Explains Everything

For psychologists who study it, disgust is one of the primal emotions that define — and explain — humanity.

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dimanche 26 décembre 2021

‘Magic’ Weight-Loss Pills and Covid Cures: Dr. Oz Under the Microscope

The celebrity physician, a candidate in Pennsylvania’s Republican primary for Senate, has a long history of dispensing dubious medical advice on his daytime show and on Fox News.

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Why Older Women Face Greater Financial Hardship Than Older Men

In a troubling picture, American women are looking at a rockier road to secure retirement than their male counterparts.

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samedi 25 décembre 2021

Many African Countries Toughen Covid Restrictions as Fourth Wave Spreads

Infections have more than doubled or tripled in many countries, prompting the authorities to reimpose curfews and quarantines and introduce vaccine mandates as the holiday season gets underway.

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vendredi 24 décembre 2021

James F. Fries, Who Studied the Good Life and How to Live It, Dies at 83

He showed that while a healthy lifestyle won’t help us live much longer, it can stave off chronic disease and disability until our final years.

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jeudi 23 décembre 2021

National Guard members take on new roles at nursing homes.



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Merck’s Covid Pill Is Authorized by F.D.A. for High-Risk Adults

The F.D.A. said the drug should be prescribed mainly when other treatments were “not accessible or clinically appropriate.”

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Beneath a Covid Vaccine Debacle, 30 Years of Government Culpability

Washington has rejected plans to revamp vaccine preparedness for decades and repeatedly paid a price. The Biden administration is at a similar crossroads.

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What Does It Mean to Be ‘Fully Vaccinated’ Against Covid-19?

With all the uncertainty around the Omicron variant, vaccine guidelines are evolving.

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What Does It Mean to Be ‘Fully Vaccinated’ Against Covid-19?

With all the uncertainty around the Omicron variant, vaccine guidelines are evolving.

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Beneath a Covid Vaccine Debacle, 30 Years of Government Culpability

Washington has rejected plans to revamp vaccine preparedness for decades and repeatedly paid a price. The Biden administration is at a similar crossroads.

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mercredi 22 décembre 2021

Biden Promised 500 Million Tests, but Americans Will Have to Wait

Contracts to purchase tests could be signed as soon as next week, but relief could be weeks away for people trying to buy the hard-to-find tests.

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Omicron Infections Seem to Be Milder, Three Research Teams Report

The data offer a rare bit of good news. Still, hospitalizations are likely to increase simply because the variant is so contagious.

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Colleges Fear Mental Health Crisis Amid Covid Surge

After almost two years of remote schooling, restricted gatherings and constant testing, many students are isolated and depressed. Omicron may make things worse.

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National Guard Takes on New Roles in Understaffed Nursing Homes

In Minnesota, an ambitious initiative is training hundreds of Guard members to become certified nursing assistants and relieve burned out nursing home workers.

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F.D.A. Clears Pfizer’s Covid Pill for High-Risk Patients 12 and Older

The first-of-its-kind treatment, Paxlovid, has been found to be highly protective against severe illness. It could be available within a few days.

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How a Hearing Test for Babies Has Paid Off for a Big Medical Provider

Routine use of a more advanced screening method turns a low-cost procedure into a pricier one.

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How Exercise May Impact Our Alcohol Consumption

People who are aerobically fit and work out a lot tend to imbibe more than their less fit peers.

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mardi 21 décembre 2021

How to Travel Responsibly During the Holidays Amid Omicron Wave

Even as the variant surges, the seasonal travel rush seems unstoppable, but there are steps you can take to travel more responsibly and mitigate the health risks for yourself — and others.

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Hospitals Scramble as Antibody Treatments Fail Against Omicron

The single remaining monoclonal antibody therapy effective against the variant is now in short supply in the U.S., imperiling an option that doctors and hospitals have relied on.

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All Anyone Wants for Christmas Is a Covid Test

Up until last week, many Americans were worried about their holiday presents arriving on time. Now, rapid tests are at the top of their list.

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How Volunteering Can Help Ease Loneliness

Science tells us the solution may lie in what we do for others, not ourselves.

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In a Boston Court, a Harsh Spotlight Falls on a Heavyweight of Science

The trial of Charles Lieber offers a peek inside the world of big-money, big-prestige science as the U.S. cracked down on Chinese funding.

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In a Boston Court, a Harsh Spotlight Falls on a Heavyweight of Science

The trial of Charles Lieber offers a peek inside the world of big-money, big-prestige science as the U.S. cracked down on Chinese funding.

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Family in Nigeria Lost 3 Daughters to Sickle Cell. Can They Save a Fourth?

About 150,000 babies are born each year in Nigeria with sickle cell, a deadly disease. Tens of thousands of them die annually before their fifth birthdays.

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To Fight Omicron, Biden Plans Aid From Military and 500 Million Tests

The president is set to unveil his initiatives, which also include creating new federal testing sites and deploying federal vaccinators, in a speech on Tuesday.

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To Fight Omicron, Biden Plans Aid From Military and 500 Million Tests

The president is set to unveil his initiatives, which also include creating new federal testing sites and deploying federal vaccinators, in a speech on Tuesday.

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lundi 20 décembre 2021

Novavax’s Covid Vaccine Is Authorized in Europe

The vaccine will be the fifth to become available in the E.U., which already has ample supplies.

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C.D.C. Says Unvaccinated Students Exposed to Virus Can ‘Test and Stay’

Two new studies show that unvaccinated children exposed to the virus are safe to stay in school if they remain asymptomatic and get tested twice over the course of a week.

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Parents Grapple With How Long to Wait for Their Children’s Second Shots

Waiting eight weeks or more between doses may boost immunity. But as Omicron slams the United States, waiting also comes with risks.

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The E.R.A. Test Claims to Boost I.V.F. Success. The Science Is Unclear.

I.V.F. patients are faced with a growing list of costly “add-ons.” For one such test, some say more robust research is needed to support its effectiveness.

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‘Schizophrenia’ Still Carries a Stigma. Will Changing the Name Help?

Many people with or connected to the mental illness approve of updating the name, a new survey shows. But some experts are not convinced it’s the answer.

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Moderna Says Its Booster Significantly Raises Antibodies Against Omicron

A 50-microgram dose increased antibodies by roughly 37-fold, and a full dose of 100 micrograms was even more powerful, the company said.

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Tips for Decluttering Your Home

All that “stuff” in our drawers, closets and corners is a hazard, but there are ways to keep it at bay.

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In ‘Desperate,’ a Reporter Dives Deep Into Dirty Water

Kris Maher, who writes about the environmental problems facing a county in West Virginia, talks about how working on his book changed his understanding of Appalachia.

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dimanche 19 décembre 2021

Most of the World’s Vaccines Likely Won’t Prevent Infection From Omicron

They do seem to offer significant protection against severe illness, but the consequences of rapidly spreading infection worry many public health experts.

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samedi 18 décembre 2021

Shirley Zussman, Indefatigable Sex Therapist, Is Dead at 107

After she and her husband attended a Masters and Johnson lecture in 1966, they joined the burgeoning field of sexology. She remained active well into the 21st century.

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A Popular Test Claims to Boost I.V.F. Success. The Science Is Unclear.

I.V.F. patients are faced with a growing list of costly “add-ons.” For one such test, some say more robust research is needed to support its effectiveness.

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vendredi 17 décembre 2021

The C.D.C. recommends that other vaccines be preferred over J.&J.

The agency’s advisers cited concerns about the increased incidence of a rare but potentially serious blood clotting condition among those who received the company’s shot.

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Is It Safe to Travel? Can I Still See My Family on Christmas?

Omicron has cast a shadow over holiday plans.

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C.D.C. Says Unvaccinated Students Exposed to Virus Can ‘Test and Stay’

Two new studies show that unvaccinated children exposed to the virus are safe to stay in school if they remain asymptomatic and get tested twice over the course of a week.

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Protect Abortion Rights? Virginia Democrats’ Vacation Plans Get in the Way.

Some Virginia Democrats want to codify abortion rights into state law in their final weeks in power. But several state senators do not want to upend their travel to Hawaii, Europe and Africa.

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jeudi 16 décembre 2021

Judge Overturns Purdue Pharma’s Opioid Settlement

The ruling said the company’s owners, members of the Sackler family, could not receive protection from civil lawsuits in return for a $4.5 billion contribution.

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Scientists Are Racing to Gauge the Threat of Omicron

The variant will spread quickly through the United States, experts say. What happens after that is less certain.

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A 3-D Printed Pod Inflames the Assisted Suicide Debate

The pod, known as Sarco, was conceived as a way for people to end their lives without involving a doctor. A plan to introduce it in Switzerland has raised alarm even among right-to-die advocates.

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Elizabeth Holmes Trial: Closing Arguments Are Set to Begin

On Thursday morning, prosecutors are expected to begin their closing arguments as they try to prove that Ms. Holmes, 37, is guilty of 11 counts of wire fraud and conspiracy to commit wire fraud.

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What Happens If You Test Positive for Covid While Traveling?

In the midst of the holiday season, the Omicron variant has many considering the prospects of getting stuck while traveling. Here’s what you need to know.

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mercredi 15 décembre 2021

C.D.C. Panel Will Discuss Blood Clot Risk Linked to J.&J.’s Vaccine

On Thursday, agency advisers will review updated figures showing roughly nine deaths from the rare disorder, according to a federal official.

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Vaccines will likely protect against severe disease from Omicron, new lab studies suggest.



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New Studies Raise Hopes That Vaccines Prevent Severe Disease From Omicron

In the lab, immune cells put up a strong fight against Omicron, suggesting that vaccines will be able to prevent the worst outcomes of the virus variant.

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The Pain Was Squeezing His Head Like an Octopus. What Was It?

The diagnosis came from an unlikely source.

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How Exercise Affects Metabolism and Weight Loss

A new analysis of data from “The Biggest Loser” highlights the complex ways the body compensates when we drop pounds.

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mardi 14 décembre 2021

‘The Music Man’ Once Had a Disabled Character. Then He Was Erased.

At the urging of producers, Meredith Willson cut a boy in a wheelchair from the early scripts for his 1957 musical. A look back shows what was lost.

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Pfizer’s Covid Pill Works Well, Company Confirms in Final Analysis

The treatment, called Paxlovid, is likely to work against Omicron and could be available in the United States before the end of the year.

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Senators Question Califf, the F.D.A. Nominee, on Opioid Crisis and Pandemic Response

A Senate panel hearing on Tuesday signaled that Dr. Robert Califf, who briefly led the agency during the Obama administration, had some bipartisan support.

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Biden’s administration may need more funds to fight Omicron.

With the pandemic heading into its third year, much of the money that Congress has allocated for coronavirus response has been spent.

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Big Hospital Chains Drop Vaccine Mandates for Health Workers

With the federal requirement in limbo because of legal challenges, some major multistate hospital systems have stopped enforcing their own policies.

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Pfizer Says Its Covid Pill, Paxlovid, Will Protect Against Severe Disease

The company said the pill, Paxlovid, reduced the risk of hospitalization and death by 89 percent if given within three days of the onset of symptoms.

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Firms Push for Over-the-Counter Access to Birth-Control Pills

Two drug makers have been mired for years in the pre-application phase of getting F.D.A. approval for over-the-counter use.

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Omicron Is a Dress Rehearsal for the Next Pandemic

America’s response to the variant highlights both how much progress we have made over the past two years — and how much work remains

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lundi 13 décembre 2021

Denmark and Norway Predict Drastic Spike in Omicron Cases

Health authorities in Europe are warning of a sharp increase in Omicron cases, adding to an existing surge from the Delta variant.

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How Conflicting Guidance on Travel During the Pandemic Shows Little Progress

The Omicron variant turned my trip home from South Africa into a nightmare episode of conflicting public health orders that often seemed to have little connection to science.

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Merck’s Covid Pill Might Pose Risks for Pregnant Women

Some laboratory studies suggest that molnupiravir can insert errors in DNA, which could in theory harm a developing fetus, sperm cells or children.

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Why More Kids Aren’t Getting the HPV Vaccine

The human papillomavirus vaccine can prevent six potentially lethal malignancies, but inoculation is meeting with rising resistance from parents.

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samedi 11 décembre 2021

British studies warn of Omicron’s speed, and one notes the need for boosters.



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Margaret Giannini, Champion of People With Disabilities, Dies at 100

After meeting the parents of children with a range of disabilities, she decided almost on the spot to start a clinic to treat such children exclusively.

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C.D.C. vaccination data may overestimate first doses and underestimate boosters.

The main reason for the discrepancies is that state and county data does not always properly link the record of people’s booster shots to their initial vaccinations.

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Omicron is speeding through Britain, and boosters provide considerable defense, U.K. scientists say.



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Omicron is speeding through Britain, and vaccines provide reduced protection, U.K. scientists say.



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Hesitancy, Apathy and Unused Doses: Zambia’s Vaccination Challenges

Vaccinating Africa is critical to protecting the continent and the world against dangerous variants, but supply isn’t the only obstacle countries face.

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Medicare Extends Telehealth Coverage, a Lifeline for Older Americans

Medicare has extended coverage of remote health care. While telehealth removed barriers to care for many during the pandemic, some say there is more to be done.

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vendredi 10 décembre 2021

jeudi 9 décembre 2021

How Nursing Homes’ Worst Offenses Are Hidden From the Public

Thousands of problems identified by state inspectors were never publicly disclosed because of a secretive appeals process, a New York Times investigation found.

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Our Favorite Healthy Habits of 2021

From labeling your feelings to exercise snacks, here’s a roundup of some of Well’s best advice for better living.

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F.D.A. Authorizes Pfizer Boosters for 16- and 17-Year-Olds

The move clears the way for millions of teenagers to receive an additional shot, with a top regulator citing evidence that the effectiveness of two doses is waning in the age group.

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Children, Coping With Loss, Are Pandemic’s ‘Forgotten Grievers’

A bipartisan group led by two former governors is urging President Biden to help an estimated 167,000 children who have lost parents or caregivers.

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Children, Coping With Loss, Are Pandemic’s ‘Forgotten Grievers’

A bipartisan group led by two former governors is urging President Biden to help an estimated 167,000 children who have lost parents or caregivers.

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mercredi 8 décembre 2021

The World Is Unprepared for the Next Pandemic, Report Says

The latest Global Health Security Index finds that no country is positioned well to respond to outbreaks.

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The Coronavirus Attacks Fat Tissue, Scientists Find

The research may help explain why people who are overweight and obese have been at higher risk of severe illness and death from Covid.

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Elizabeth Holmes Rests Her Case in Fraud Trial

Lawyers must now agree on a set of jury instructions before closing arguments begin on Dec. 16.

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Can an Athlete’s Blood Enhance Brainpower?

Scientists who injected idle mice with blood from athletic mice found improvements in learning and memory. The findings could have implications for Alzheimer’s research and beyond.

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A Penny for Your Squats? A Tiny Monetary Award Motivated Hundreds to Exercise.

Among 52 incentives to exercise, giving people a 9-cent award if they returned to the gym after missing a workout helped the most.

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We’re Getting Close to ‘Universal’ Vaccines. It Hasn’t Been Easy.

A new class of flu vaccines could eventually save millions of lives — and perhaps stop the next pandemic — if scientists can overcome the remaining obstacles.

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mardi 7 décembre 2021

Pfizer’s vaccine provides some protection against Omicron, a lab study suggests.

A South African study found that Omicron may dull the power of coronavirus vaccines, but hinted that booster shots might help.

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Surgeon General Warns of Youth Mental Health Crisis

The coronavirus pandemic intensified a rise in adolescent depression, anxiety and mental health distress that was underway before the spring of 2020.

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Pediatricians Find Children Need Much More Than Vaccines

At one clinic serving low-income children, treatment for health problems that have gone unchecked during the pandemic is more in demand than coronavirus shots.

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The U.S. surgeon general warns of a mental health crisis among young people, worsened by the pandemic.

The message came as part of a rare public advisory from the nation’s top physician, Dr. Vivek H. Murthy.

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Is Gluten-Free Bread Healthier than Regular Bread?

Experts say there are important distinctions to keep in mind.

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In Chicago, a New Approach to Gay and Bisexual Men With Prostate Cancer

A new clinic focuses on patients left grappling with the aftermath of treatment in ways that are rarely appreciated by doctors.

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New Covid Pills Offer Hope as Omicron Looms

Merck and Pfizer will soon debut prescription pills to treat Covid-19. And more drugs are on the way.

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lundi 6 décembre 2021

Biden Focuses on How Spending Bill Would Lower Drug Costs

President Biden emphasized how the bill would lower prescription drug costs, an issue his administration hopes will build support for the broader package.

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Women Earn $2 Million Less Than Men in Their Careers as Doctors

A survey of more than 80,000 physicians estimated that women make 25 percent less than men over a 40-year career.

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The Pandemic Has Your Blood Pressure Rising? You’re Not Alone.

Average blood pressure readings increased as the coronavirus spread, new research suggests. The finding portends medical repercussions far beyond Covid-19.

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dimanche 5 décembre 2021

Omicron Case With a New York Tie Shows How Virus Outpaces Response

A health care analyst came to Manhattan for an anime convention. His trip shows how the virus once again outpaced the public health response.

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J.&J. Booster Worked for People Who Got Pfizer Shots in Study

A small study in Boston looked at mixing and matching with the third shot.

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U.S. Omicron Cases Likely to Rise, Officials Say, As Uncertainties Remain

Many states have detected cases, including in some people who have no known history of recent travel abroad, which experts have said suggests community spread of the variant in the United States.

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samedi 4 décembre 2021

Facing Economic Collapse, Afghanistan Is Gripped by Starvation

An estimated 22.8 million people — more than half the country’s population — are expected to face potentially life-threatening food insecurity this winter. Many are already on the brink of catastrophe.

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Dr. Sherif R. Zaki, Acclaimed Disease Detective, Dies at 65

He helped identify numerous viruses, including Covid-19, as well as the bioterrorism attack that spread anthrax in 2001.

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The Variant Hunters: Inside South Africa’s Effort to Stanch Dangerous Mutations

Scientists in a cutting-edge laboratory do part of the work. Local health workers on foot do the rest.

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vendredi 3 décembre 2021

Omicron Variant Spreading Twice as Quickly as Delta in South Africa

A new mathematical analysis strengthens concerns about the effects of the new variant on the pandemic’s course.

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Omicron is spreading more than twice as quickly as the Delta variant in South Africa, scientists report.

If the finding holds up elsewhere, Omicron may be more difficult to contain than previous iterations of the coronavirus, lengthening the pandemic.

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Omicron and Travel: So, Now Do I Need Trip Insurance?

In light of the new variant, is extra protection warranted for things like flight and lodging cancellations and quarantine hotels? It depends. Here’s what you need to know.

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Cognitive Rehab: One Patient’s Painstaking Path Through Long Covid Therapy

Samantha Lewis is relearning some basic aspects of her daily life after struggling with brain fog and other lingering symptoms for more than a year since being infected by the virus.

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Are My Stomach Problems Really All in My Head?

Scientists often debate whether irritable bowel syndrome is a mental or physical issue. That’s not much help for those who suffer from it.

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jeudi 2 décembre 2021

Most Covid Vaccines Will Work as Boosters, Study Suggests

In a comparison of seven different brands, researchers found that most shots give a strong boost, even in mix-and-match combinations.

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Why hasn’t the U.S. found more Omicron cases?



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Why Didn’t the U.S. Detect Omicron Cases Sooner?

Genomic surveillance has improved enormously in recent months, but the system has built-in delays, and blind spots remain.

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Missouri Withheld Data Showing Effectiveness of Mask Mandates

Mask requirements prevented Covid-19 cases and deaths in Missouri, the state found, but data supporting that conclusion was not released until a month later.

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Omicron Is Here. Should You Cancel Your Trip?

Most people have become used to making health-risk assessments during the pandemic, but that doesn’t make the decision about whether to travel or cancel easier — especially with a new variant circulating.

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Why Hasn’t the U.S. Found More Omicron Cases?

Genomic surveillance has improved enormously in recent months, but the system has built-in delays, and blind spots remain.

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What Can One Life Tell Us About the Battle Against H.I.V.?

In 2001, U.N. estimates suggested 150 million people would be infected with H.I.V. by 2021. That preceded an ambitious global campaign to curb the virus. How well did it work?

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The Toddler Was Bowlegged, Her Gait Awkward. What Was It?

What the orthopedist saw on the X-rays surprised him.

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mercredi 1 décembre 2021

Omicron Prompts Swift Reconsideration of Boosters Among Scientists

Many public health experts were opposed to a boosters-for-all approach. The new variant is changing some minds.

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Omicron Prompts Swift Reconsideration of Boosters Among Scientists

Many public health experts were opposed to a boosters-for-all approach. The new variant is changing some minds.

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The First Omicron Case Has Been Detected in the U.S.

Much remains unknown about the new variant of the coronavirus. But with cases being detected in more countries, experts had said it was only a matter of time before the variant showed up in the United States.

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C.D.C. Tells Airlines to Disclose Details on Passengers From Southern Africa

The agency said it was “issuing this directive to prevent the importation and spread of a communicable disease of public health importance,” an apparent reference to the new Omicron variant.

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Build Back Better Act Would Patch Holes in Health Coverage

Taken together, the provisions in the social policy bill represent the biggest step toward universal coverage since the passage of the Affordable Care Act.

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Vaccine Hesitancy Hurts Covid Fight in Poorer Countries

Vaccines are finally available in many African countries, but some people there, as well as in South Asia, are wary of taking them.

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Build Back Better Act Would Patch Holes in Health Coverage

Taken together, the provisions in the social policy bill represent the biggest step toward universal coverage since the passage of the Affordable Care Act.

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Trust in Science and Scientists Increased Globally, Poll Finds

An international survey found that the pandemic had enhanced public faith in researchers and science, up from 2018.

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How Exercise May Support the Aging Brain

Simple activities like walking boost immune cells in the brain that may help to keep memory sharp and even ward off Alzheimer’s disease.

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