Covid-19 Vaccines


  1. PhotoScientists worry that if vaccinated people are silent spreaders of the virus, they may keep it circulating in their communities, putting unvaccinated people at risk.
    CreditMax Whittaker for The New York Times

    Here’s Why Vaccinated People Still Need to Wear a Mask

    The new vaccines will probably prevent you from getting sick with Covid. No one knows yet whether they will keep you from spreading the virus to others — but that information is coming.


    1. PhotoDr. Anthony S. Fauci in March. “We really don’t know what the real number is,” he said recently.
      CreditDoug Mills/The New York Times

      How Much Herd Immunity Is Enough?

      Scientists initially estimated that 60 to 70 percent of the population needed to acquire resistance to the coronavirus to banish it. Now Dr. Anthony Fauci and others are quietly shifting that number upward.


Britain's Rollout

  1. PhotoA pedestrian walks past an electronic information board displaying Covid-19 information relating to a 'variant of concern in the area' in Blackburn, England.
    CreditOli Scarff/Agence France-Presse — Getty Images

    The Delta Variant: What Scientists Know

    The variant is gaining traction worldwide. But vaccines are driving down coronavirus case numbers in the U.S., and it’s unclear whether Delta will reverse that trend.


Pfizer-BioNTech Vaccine

  1. PhotoMedical workers administering vaccines at a school in Taipei, Taiwan, this month.
    CreditAnn Wang/Reuters

    Taiwan Wants German Vaccines. China May Be Standing in Its Way.

    The two sides have traded accusations about whether political motivations are keeping the Taiwanese people from receiving immunizations amid the island’s first major Covid-19 outbreak.

    By Raymond Zhong and

Moderna Vaccine