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It's still unclear whether that takes place (that COVID-19 can spread before people show sings of being infected). But if it does, that might explain why the disease is spreading so quickly.

— Malik Peiris Malik Peiris (2020)

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