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The person you are replying to is talking specifically about Influenza which isn't spread as widely through droplets, while COVID-19 is spread this way almost exclusively.

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"Most experts think that flu viruses spread mainly by droplets..." (https://www.cdc.gov/flu/about/disease/spread.htm)

Mainly /= exclusively. COVID as far as we know are spread exclusively through droplets. Influenza can be aerosolized https://www.cdc.gov/niosh/topics/flu/transmission.html

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