It is driving up infection rates in every state of the U.S., prompting the Centers for Disease Control and Prevention (CDC) to once again recommend universal mask-wearing. This variant, first identified in India in December, spreads faster than any previous strain of SARS-CoV-2, as the COVID-19 virus is officially named. receded, some epidemiologists were cautiously optimistic that the rapid vaccine rollout would soon tame the variants and cause the pandemic to wind down. Still, by March, as the winter surge in the U.S. Then Beta made young people sicker and Gamma reinfected those who'd already recovered from COVID-19. In the beginning of the pandemic, they said mutated versions of the virus wouldn't be much of a problem-until the more-infectious Alpha caused a spike in cases last fall. Scientists keep underestimating the coronavirus. (Court, 8/3)Ī Doomsday COVID Variant Worse Than Delta And Lambda May Be Coming, Scientists Say That represents a “much higher” bar than previous estimates of 60% to 70%, because delta is twice as transmissible, said Richard Franco, an assistant professor at the University of Alabama at Birmingham. The spread of the delta coronavirus variant has pushed the threshold for herd immunity to well over 80% and potentially approaching 90%, according to an Infectious Diseases Society of America briefing on Tuesday.
Meanwhile, the quick spread of the delta variant changes Americans' views about the state of the pandemic - but not the behaviors of the unvaccinated.ĭelta Variant Spread Seen Pushing Covid Herd Immunity Threshold Above 80% Health experts try to predict the future path of the unpredictable coronavirus. Clock Ticking: Herd Immunity Bar Now Higher Will ‘Doomsday’ Variant Emerge?
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