Debunking the idea viruses evolve to become less virulent:
than prior COVID-19 strains, one oft-cited explanation is that viruses always evolve to become less virulent over time.The idea that infections tend to become less lethal over time was first proposed by notable bacteriologist Dr. Theobald Smith in the late 1800s. HisSimple and elegant, Smith's theory was that to ensure their own survival, pathogens evolve to stop killing their human hosts.
Some variants, however, have clear"advantages to continued survival, such as those that evade the immune system and spread easily," said Dr. Abir Hussein, associate medical director for infection presentation and control at University of Washington Medical Center. "This is not because the variant is less virulent, but because your immune system was primed from prior vaccination and infection," said Pekosz.
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