A new Covid-19 variant called NB.1.8.1, or Nimbus, represents about a third of new US Covid-19 cases. Dr. Leana Wen answers ...

The new COVID-19 variant, called nimbus, has similar symptoms and recovery to the Omicron strain. Costa Rican court orders ...

Airport screening in the U.S. detected the new variant in travelers arriving in California, Washington state, Virginia and ...

A new COVID variant, NB.1.8.1, was detected in Washington. These are the symptoms to watch for and recommended vaccinations.

From the first reported case of AIDS to the present, what is the history of HIV-AIDS and are there parallels to the COVID-19 pandemic?

New study shows social media use predicted future depression in tweens. Researchers followed thousands of pre-teens for three years, generating unique insights into how social media is shaping kids.

According to the CDC, more than 1.2 million Americans have died from or with Covid-19 since January 2020. At least 11,000 U.S. deaths have been recorded in 2025 alone, including nearly 1,000 ...

According to research from Washington State University, HKU5-CoV-2 can replicate in human gut and airway cells and may be capable of infecting a wider range of animals than Covid-19. A slight ...

Once again, a new strain of COVID has hit the country, and that includes Rhode Island. According to the Centers for Disease ...

Nimbus (NB.1.8.1) is a descendant of the Omicron variant, and was first detected in January 2025. Since then, it has spread quickly across many countries, including the United States, Canada, the ...

The incubation period for the coronavirus is between 2 and 14 days. On average, COVID-19 symptoms appear around 5 days after exposure, but this can vary. Learn more.