With the Delta variant in play, federal health officials are analyzing the latest numbers to look at the frequency and seriousness of COVID-19 breakthrough infections. Will we need booster shots? And ...

Several COVID-19 variants are acting uniquely enough to qualify as a distinct strain. And you might have heard about one on ...

LAS VEGAS, NEVADA -- A California couple says they were fully vaccinated, but still contracted COVID-19 while on vacation as experts say breakthrough cases are possible, especially with the delta ...

Vaccine effectiveness against COVID-19 infection dropped from 91% to 66% once the delta variant accounted for the majority of circulating virus, according to a study published Tuesday by the U.S.

Please provide your email address to receive an email when new articles are posted on . Prolonged COVID-19 symptoms, including severe fatigue, were more common among patients infected during the ...

Estimates show the variant accounts for over 51% of all new cases nationwide. A highly contagious variant of the novel coronavirus that was initially identified in India is now the dominant strain in ...

Is the delta variant of the coronavirus worse for kids? Experts say there’s no strong evidence that it makes children and teens sicker than earlier versions of the virus, although delta has led to a ...

Planning an international vacation was stressful enough before COVID-19 emerged. Now, the pandemic has travelers jumping through even more hoops. Certain countries have lifted travel restrictions ...

Part of the problem is low vaccination rates, experts said. The Centers for Disease Control and Prevention assigned two federal "surge team" members to Missouri this week to help fight the state's ...

Increased risk of DENV-infection (primarily DENV3) was observed up to 300 days post-SARS-CoV-2 infection (predominantly Omicron). While not irrefutable proof for possible antibody-dependent ...