A slow immune response to SARS-CoV-2 infection, delayed viral clearance, and viral rebound can all increase a person’s risk ...

Imagine a previously unknown bug—new to our immune defenses—that suddenly emerged and rapidly spread all over the globe, ...

People who later experienced persistent shortness of breath or fatigue after a SARS-CoV-2 infection were already taking ...

Nothing like Covid-19 had been seen in the United States in more than 100 years, and everyone from the president and ...

Between April 2020 and December 2022, over 535,000 people in Germany downloaded and activated the Corona Data Donation App ...

CoV-2 nucleocapsid antibodies to detect exposure to SARS-CoV-2: results from a prospective cohort study on COVID-19 ...

The United States government will no longer issue free COVID-19 tests. Here are some places near you where you can get them ...

Ensitrelvir PEP was safe and effective for COVID-19 prevention among household contacts when administered after the onset of symptoms in an index patient.

The government program distributing free COVID tests to American households has been suspended. Where else to look for free and low-cost testing.

Kei Sato was looking for his next big challenge five years ago when it smacked him — and the world — in the face. The ...

Five young volunteers here have been deliberately exposed to the Covid-19 virus in the country’s first human challenge study, ...

Five years after an official state of emergency was declared, this is the first in a series of Herald articles exploring the ...