Katherine MacLean - Contagion

Minos was such a lovely planet. Not a thing seemed wrong with it. Excepting the food, perhaps. And a disease that wasn't really. Originally published in Galaxy Science Fiction, October, 1950. Katherine Anne MacLean (born January 22, 1925) is an American science fiction author best known for her short fiction of the 1950s which examined the impact of technological advances on individuals and society. — Summary by wikipedia, story heading, and david wales