Later, in Peru, they volunteer for three weeks at the San Pablo leper colony. There, Guevara observes both literally and metaphorically the division of society, as the staff live on the north side of a river, separated from the deprived lepers living across the river to the south. To demonstrate his solidarity, and his medical belief that leprosy is not contagious, Guevara refuses to wear rubber gloves during his visit as the head nun requires, choosing instead to shake bare hands and interact normally with the surprised leper patients.