4 years ago

https://www.wsj.com/articles/covid-19-herd-provincetown-mayo-delta-mask-mandate-vaccine-passport-cdc-mucosal-immunity-11629128219?mod=opinion_lead_pos6
https://www.cdc.gov/flu/pandemic-resources/1918-pandemic-h1n1.html
https://www.latimes.com/business/story/2021-08-16/doctors-coronavirus-misinformation-license
https://respectfulinsolence.com/2021/08/11/physicians-who-promote-covid-19-and-antivaccine-misinformation-should-lose-their-medical-license/

USA TODAY: Fact check: Yes, viruses can mutate to become more deadly
https://www.usatoday.com/story/news/factcheck/2021/07/14/fact-check-viruses-can-mutate-become-more-deadly/7839167002/
The claim: Viruses never mutate to become more lethal

As the U.S. faces down the COVID-19 Delta variant – now fast-becoming the nation's dominant strain – reports of a new Lambda variant that first emerged in Peru in August 2020 are gaining the attention of public health officials worldwide.

News of this coronavirus variant is concerning, especially what it could mean for new COVID-19 cases, hospitalizations and deaths, all of which had been declining in the last few months. But one tweet being shared across social media claims new viral strains are nothing to be worried about.

"One more time, for the folks in the back: In the history of virology, there has never, EVER, been a viral mutation that resulted in a virus that was MORE lethal," reads a tweet by Dr. Kelly Victory shared in a June 30 Facebook post.

This evolutionary trade-off likely can keep a virus in check, but it's not as black-and-white as Victory makes it out to be. Experts say viral mutation is a complex calculus but there are several instances where viruses have evolved into more lethal strains.

Victory claims no virus has ever become more deadly over time, but experts say that's not the case.

"The statement that 'in the history of virology, there has never, ever, been a viral mutation that resulted in a virus that was more lethal' appears to be quite untrue," Timothy Sheahan, virologist and assistant professor for the Gillings School of Global Public Health of the University of North Carolina, told USA TODAY.

Sheahan pointed to several examples such as the Ebola virus, which was discovered in 2016 to have undergone a mutation that not only made it more transmissible but likely more infective. This variant eventually died when the epidemic ended in 2016. The West Nile virus was found in 1999 to have mutated into a highly virulent strain, killing crows on multiple continents.

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