Flu Vaccination Associated With Increased Viral Shedding

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STORY AT-A-GLANCE

  • University of Maryland researchers revealed that repeated vaccination increases the amount of influenza virus exhaled into the air
  • Researchers observed 6.3 times more aerosol shedding among cases with vaccination in the current and previous season compared with having no vaccination in those two seasons
  • The CDC states that shedding of the live attenuated vaccine virus is “common” after receipt of live attenuated influenza vaccine
  • There’s no way to know for sure how often vaccine-strain live virus shedding and disease transmission actually occurs, since it’s not being actively monitored or tested for
  • In June 2020, biotechnology company Meissa Vaccines announced that it has initiated preclinical studies and manufacturing of a live attenuated COVID-19 vaccine

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