While respiratory viruses can theoretically survive for days outside the body — such as on a licked mail-in ballot envelope — it stands to reason that in-person voting carries greater potential for person-to-person viral spread than mail-in voting. The election expert Rick Hasen, a professor of law and political science at U.C. Irvine, has recently called on Congress to pass a law making it easy for Americans in all states to cast absentee ballots in November.
How Much Does Voting Spread Viruses?
The New York Times, March 16, 2020
March 16, 2020