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 ...

When someone close to you tests positive for COVID-19, it’s natural to feel an immediate sense of urgency. The question that often follows is simple but critical: how long should you wait before ...

The National Academies of Sciences, Engineering, and Medicine are private, nonprofit institutions that provide expert advice on some of the most pressing challenges facing the nation and world. Our ...

Six years after the start of the COVID-19 pandemic, the virus still exists. A public health expert explains what Long COVID ...

As summer comes to an end, COVID-19 cases are on the rise again in California. While respiratory viruses usually peak in the winter, the novel coronavirus can also surge in the warmer months.

A new program from eMed and the NIH offers free tests and treatments, and you don't even need to leave your home.

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 ...