A study that has yet to receive peer review claimed that COVID-19 treatment Lagevrio gives rise to new mutations of the SARS-CoV-2 virus.

 A study that has yet to receive peer review claimed that COVID-19 treatment Lagevrio gives rise to new mutations of the SARS-CoV-2 virus.

Image provided by Merck & Co. showing their new antiviral medication. AP.

A study that has yet to receive peer review claimed that COVID-19 treatment Lagevrio gives rise to new mutations of the SARS-CoV-2 virus.

 Mutations linked to the drug have not resulted in more lethal or immune-evasive forms of the virus, according to the study.


  • Researchers from the U.S. and several U.K. institutions published a preprint study on Friday, claiming that the use of Lagevrio, a treatment for COVID-19, is linked to mutations in the SARS-CoV-2 virus.
  • The treatment is intended to reduce the chances of severe illness by altering the SARS-CoV-2 genome to prevent the virus from replicating in the human body. 
  • The study's findings have revived concern among experts that the drug may cause problematic mutations.
  • The fears were largely "theoretical" but the preprint "validates a lot of those concerns," said Jonathan Li, a virologist at Harvard Medical School.
  • Merck, the drug's manufacturer, has disputed the findings, saying that "there is no evidence to indicate that any antiviral agent has contributed to the emergence of circulating variants."


  • The study was published on a "preprint server" that allows new research to become widely accessible before going through standard review procedures. 
  • Prominent scientific journals do not publish studies until they have been subjected to scrutiny by outside experts, a process known as "peer review."

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