Helen Branswell covers issues broadly related to infectious diseases, including outbreaks, preparedness, research, and vaccine development. Follow her on Mastodon and Bluesky. You can reach Helen on ...

The timing of symptom onset depends on lots of factors, including the amount of virus to which someone was exposed, Hotez says. Their level of pre-existing immunity may also affect the likelihood or ...

Apple enhanced its Siri voice assistant Saturday with a step-by-step query instructing users on determining if they have been exposed to COVID-19, the worldwide coronavirus pandemic. The instructions ...

Looking for information about the FDA’s limited approval of 2025-26 COVID vaccines? Read what we know about who can get an updated COVID shot this year. Updated Aug. 27 If it feels like several people ...

The US government has been helping people detect COVID-19 at home for several years with free COVID test kits delivered by the US Postal Service. On Sunday, March 9, the Department of Health and Human ...

This article has been updated. The Food and Drug Administration gave Covid vaccine manufacturers instructions on what next fall’s Covid vaccines should target on Thursday, signaling it would prefer ...