Study: COVID Shot Enhances Delta Infectivity

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STORY AT-A-GLANCE

  • According to the U.S. Centers for Disease Control and Prevention, people who got the COVID shot early are now at increased risk for severe COVID disease
  • This may be a sign that antibody dependent enhancement (ADE) is occurring, or it may simply indicate that the protection offered is limited to a few months, at best
  • Recent research warns the Delta variant “is posed to acquire complete resistance to wild-type spike vaccines.” This could turn into a worst-case scenario that sets up those who have received the Pfizer shots for more severe illness when exposed to the virus
  • To “stay ahead of the virus,” the Biden administration is now considering recommending a booster shot five months after the initial two doses rather than waiting eight months, as previously suggested
  • Israeli data show Pfizer’s shot went from a 95% effectiveness at the outset to 39% by late July 2021, when the Delta strain became predominant. The U.S. Food and Drug Administration’s expectation for any vaccine is an efficacy rate of at least 50% compared to placebo

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