Since the start of the COVID-19 pandemic in 2019, the SARS-CoV-2 virus has produced a number of variants, including alpha, beta, delta and omicron, each with its own subvariants. New research, published Sept. 22 in Science Advances, used engineered mice to compare SARS-COV-2 omicron subvariants, and found one of them, BA.5, was more virulent likely due to its ability to rapidly replicate early during infection. The study addresses a challenge to studying and understanding rapidly evolving variants of concern due to a lack of animal models for running tests that could help explain why variants and subvariants each behave differently in people.

https://www.miragenews.com/contagious-omicron-strain-replicates-early-in-1091313/

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