A strain of coronavirus that has been infecting pigs in China since 2016 — causing them severe diarrhoea and vomiting — could spread to humans, a study has warned. The strain — 'swine acute diarrhoea syndrome coronavirus', or SADS-CoV — is thought to have come from bats, and has been concerning the livestock industry. It is most dangerous to piglets. A wider outbreak of SADS-CoV could cause severe economic damage in those countries that rely on pork production and sales.