- Pfizer, Biontech say trials suggest Covid vaccine works against South African variant, is effective after 6 monthsNBC News
- Ongoing trial shows Pfizer Covid-19 vaccine remains highly effective after six monthsCNN
- Pfizer Canada says it’s possible for additional doses to arriveCBC News
- Op-ed: 7 concerns about the COVID-19 vaccines, explainedChicago Tribune
- Covid-19 and Vaccine News: Live UpdatesThe New York Times
- View Full Coverage on Google News