Covid-19 Vaccine Card Guide: Keeping it Safe, Travel, Information, Passport and Benefits

For now, the best way to show that you’ve been inoculated against the coronavirus is a simple white card. Here, your key questions answered.

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Factory Mix-Up Ruins Up to 15 Million Vaccine Doses From Johnson & Johnson

A manufacturing subcontractor in Baltimore mixed ingredients from the coronavirus vaccines of Johnson & Johnson and AstraZeneca, setting back U.S. production of the “one-and-done” shot.

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A ‘Game Changer’ for Patients With Esophageal Cancer

A drug that unleashes the immune system offers a rare glimmer of hope for those with a cancer that resists most treatments.

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The C.D.C. and N.I.H. launch a rapid, at-home testing initiative in Tennessee and North Carolina.

The new initiative is an important step in determining whether widespread rapid testing can help curb transmission of the virus.

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Italy Pushes Back as Health Care Workers Shun Covid Vaccines

Prime Minister Mario Draghi issued a decree requiring that workers in health care facilities be vaccinated, a move that will test the legal limits of his government’s efforts to stem coronavirus outbreaks.

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Virus Variants Can Infect Mice, Scientists Report

Infected rodents pose no immediate danger to humans, but the research suggests that mutations are helping the coronavirus expand its range of potential hosts.

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Walking and Other Aerobic Exercise May Aid the Aging Brain

Older people with mild cognitive impairment showed improvements in brain blood flow and memory after a yearlong aerobic exercise program.

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