Cargill Inc shuttered animal-feed mills in China in recent months partly because the rapid spread of a fatal hog disease has reduced demand, a company executive said on Friday.

The closures highlight the pain for global agriculture companies from the outbreak of African swine fever in China, the world’s top hog producer and pork consumer.

African swine fever, for which there is no cure and no vaccine, kills almost all infected pigs, though it does not harm people.