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This is common (that genetic variations commonly occurred when viruses spread from host to host). While the virus replicates itself and spreads from one host to another, there might be some mutations.

— Chee Hui Yee Chee Hui Yee (2020)

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Quote text and notes from Wikiquote: Chee Hui Yee (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.