Which of the following affects an individual's likelihood of being infected?

Which of the following is a methods of protection from SARS-CoV-2 virions.

At least how many hours can some of the airborne SARS-CoV-2 virions survive after aerosolization?

Approximately how many microns in diameter is the smallest particle of concern of a virion?

The smallest virion can be filtered by the HEPA filter.

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