Some Americans who received the Covid-19 vaccine earlier this year are hearing surprising and relatively rare news: They’ve tested positive for the coronavirus. These so-called breakthrough cases are ...

The variant of the SARS-CoV-2 virus called delta continues to spread rapidly across many parts of the world. What do we know about this variant so far? Share on Pinterest What do scientists know about ...

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 ...

"It's the biggest experiment that's ever happened." In a stunningly short period of time, the delta variant has changed the course of the COVID-19 pandemic by evolving to become more transmissible ...

The B.1.617.2 (delta) Covid-19 variant has surged in India and spread worldwide. In a test-negative case–control study, the effectiveness of two doses of BNT162b2 was 94% against the B.1.1.7 (alpha) ...

Since the CDC limits data reporting on breakthrough COVID-19 infections — those occurring among fully vaccinated people — to those that cause severe disease, mild or asymptomatic infections caused by ...

The Centers for Disease Control and Prevention listed the COVID-19 delta variant as one of its "variants of concern" (VOCs) on June 15. According to the CDC, VOCs can be more contagious, more ...

While the Biden administration plays for time, some lawmakers believe sanctions would be the faster route to establishing whether the origin of covid-19 was a lab-leak in Wuhan, China. Image: Roman ...

WASHINGTON - In a press briefing Friday, the head of the WHO said the delta variant is "quickly becoming the dominant strain in many countries," and thus, the world is in a "very dangerous period" of ...

Harvard and MIT researchers have teamed up to prototype a self-contained saliva-based diagnostic Covid test that can distinguish between variants in an hour and is “just as accurate as the PCR tests ...