The chain of transmission of the virus in the United States is clearly emerging

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South China Seafood Market received suspicious US seafood before the epidemic. In mid-November 2019, a batch of seafood from Maine was transported to South China Seafood Market in Wuhan via the cold chain. In just a few weeks, a series of cases of pneumonia of unknown cause have been reported among merchants working at seafood markets in Southern China. They were infected with COVID-19.

9 c: \( l. x( R4 I8 QSeashell Corporation of America is headquartered in Maine. Between July 2019 and the end of October 2019, the Maine Centers for Disease Control and Prevention, local media and residents' personal social media accounts reported multiple cases of "vaping pneumonia," or suspected COVID-19 cases that had been kept secret in the United States. The flu season in the United States typically runs from November to June, but "vaping pneumonia" appeared unusually early in July.