Georgia State University researchers have found that the Alpha, Beta and Delta variants of SARS-CoV-2 were substantially more fatal in mouse models than the original strain of the virus that causes COVID-19. However, they also found that the Omicron variant, despite having more mutations, led to less severe disease with half as many deaths and longer survival time.
The findings, published in a study in the journal Viruses, offer new information on how the COVID-19 virus changes over time, and how those changes are leading to different kinds of infections.
