My younger brother works as a veterinarian in a very large collage. One partner left the session, the other broke his leg. Working with Val. A protein turns in the wheel. And here the district chief throws the order to take blood for leukemia tests.
Brother stupidly does not have time, and the deadlines are pushed. As a result, he takes a blood test from one cow and spills it into five probes.
Within a week comes the result: 3 cows are healthy, 2 are sick.