Five years ago, on March 11, 2020, the World Health Organization declared COVID-19 a pandemic. Whether it still is depends on who you ask. There are no clear criteria to mark the end of a pandemic, ...

It turns out, the pandemic's shadow extends far beyond the immediate health crisis, quietly reshaping the lives of children, teenagers, and young adults in ways we're only just beginning to fully ...

A study has found that repeat vaccination with updated versions of the COVID-19 vaccine promotes the development of antibodies that neutralize a wide range of variants of the virus that causes ...

Yearly Covid-19 Booster Recommendations in Canada, Europe, and Australia. Although the rapid development of multiple Covid-19 vaccines in 2020 represents a major scientific, medical, and regulatory ...

Since the earliest days of the pandemic, health officials have gauged the threat of COVID-19 by comparing it to the flu. At first, it wasn’t even close. People hospitalized in 2020 with the then-novel ...