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Experts are still researching the rate of effectiveness and transmissibility of some existing strains of concern.

d3sign via Getty Images Herd immunity seems almost impossible at this point. Here's how that will affect what COVID-19 will be like in the short and long term. For the first time in a long time, the U.S. is at a hopeful moment in the COVID-19 pandemic. More than half of adults have received at least one dose of a coronavirus vaccine, and the seven-day average of new cases has decreased by roughly 80% since its January 2021 peak. The director of the Centers for Disease Control and Prevention has said she’s “cautiously optimistic” that the country is turning a corner.

Updated on May 4, 2021 at 8:36 am NBCUniversal Media, LLC As more and more of the United States population gets vaccinated against COVID-19, many are wondering: when will enough people be vaccinated for life to return to normal? That question doesn't have a simple answer, but scientists are working every day to understand more about herd immunity and how it can help us return to normal life, someday. Here's what you should know. Download our mobile app for iOS or Android to get the latest breaking news and local stories. What is herd immunity? Herd immunity, also known as community immun...

Can the vaccine make your period worse? These women say yes. No published studies have examined the effects of vaccines on menstrual cycles (iStock; Lily illustration) 2h When Shana Clauson, a 45-year-old teacher in Hudson, Wis., was in line to get her first coronavirus vaccination — the Moderna shot — on March 6, she logged onto Facebook to pass the time as she waited. While scrolling, she saw a friend had posted a link to a Twitter thread in which women and people who menstruate were discussing how their periods had been altered after their vaccinations. They complained of earlier per...

First US case of more infectious ‘double mutant’ covid variant that emerged in India is identified in California Researchers at Stanford University confirmed what is believed to be the first U.S. case of a coronavirus variant that emerged in India Indian authorities have referred to it as a 'double mutant' because it has two mutations on parts of the virus that help it hook onto our cells The variant was linked to between 15% and 20% of samples sequenced from India's Maharashtra state, which has seen a 50% spike in cases in the last week Health experts believe the variant spreads more rap...