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Nearby, workers herded some of the animals onto a rotating platform within the farm’s milking parlor and quickly attached pumping equipment.

One of the two people who had antibodies worked in the farm’s cafeteria adjacent to the milking parlor — alongside farmworkers but not cattle.

On a brisk December morning, Mr. Mehuren and one of his daughters were milking their Holsteins in the small milking parlor, in six shifts of eight cows.

This includes bathrooms, the expo hall and the milking parlor.

On an overcast January day in Estelline, South Dakota, Jonathan Lundgren zips his quilted jacket over a fleece, pulls down a wool cap, and crunches through the snow on Blue Dasher Farm to his barn, a milking parlor that he has kitted out as a biochemical laboratory.