WASHINGTON—Voters heading to the polls in some Super Tuesday states will be met by workers wearing medical gloves and check-in tables decorated with Purell bottles, as the coronavirus outbreak collides with the presidential campaign.

John Gardner, an election official in a county just outside Sacramento said his office recently ordered about 350 large jugs of hand sanitizer from Costo to make poll workers and voters feel at ease during California’s primary.

Across the county’s roughly 100 polling places, medical gloves have been distributed to poll workers—a new practice there. As per usual, disinfecting wipes will be used to clean voting machines, he said.

Mr. Gardner’s team also added an extra curbside voting location where people can either drop off ballots or have a ballot brought to them by a poll worker.

“If you’re not wanting to be in a public space with a bunch of people, you can just stay in your car and flick the ballot out,” said Mr. Gardner, assistant registrar of voters in Solano County, Calif.