This reply
Lin mark this message contains misinformation
originally written by Lin
The video is authentic but it was taken in Brussels, Belgium, on March 10, 2020. The man is not an American. According to media reports, the man was arrested by the police on the same day.

References

https://medium.com/annie-lab/misleading-this-video-does-not-show-an-american-soldier-spreading-saliva-in-wuhan-a1ee9b7b816

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