NewYorkTimes

Four people so far have had allergic reactions after getting the Pfizer-BioNTech vaccine. Experts say that shouldn’t deter most people from getting a jab. View original article Contributor: Katherine J. Wu

Thanksgiving gatherings were upended by the pandemic. With Christmas upon us, families are having another round of fraught conversations about in-person celebrations. View original article Contributor: Maria Cramer and Johnny Diaz

When a single case of smallpox arrived in Manhattan in 1947, a severe outbreak was possible. A decisive civil servant made a bold decision. View original article Contributor: John Florio and Ouisie Shapiro

Test your knowledge of this week’s health news. View original article Contributor: Toby Bilanow

The smaller number of expected doses, which appeared to be the result of a scheduling hiccup, reignited tensions between the federal government and Pfizer over vaccine supply. View original article Contributor: Katie Thomas and Sharon LaFraniere

Two shots can prime the immune system to fight the coronavirus. View original article Contributor: Jonathan Corum and Carl Zimmer

“It is the American health care system, so there are bound to be loopholes.” View original article Contributor: Sarah Kliff

Valerie Louie rescued dogs and matched them with families, including ours. These beloved pets helped countless people bear up during the pandemic, making her death a particular Covid-19 cruelty. View original article Contributor: Matt Richtel

View original article Contributor: John Eligon

Pharmacists have found that they can squeeze an additional dose from some of the glass vials that were supposed to contain five doses of the Pfizer vaccine. View original article Contributor: Katie Thomas