MADRID : Health authorities have ordered the culling of all 93,000 mink at a farm in eastern Spain to prevent human contagion after discovering that most of the animals there had been infected with the coronavirus.The farm in the village of La Puebla de Valverde in the region of Aragon, 200 km (125 miles) east of Madrid, came to the attention of the authorities after the wife of one of its workers tested positive in May.Joaquin Olona, head of the Aragon agriculture department, told reporters on Thursday that seven farm workers had subsequently tested positive, including the woman's husband.Authorities initially ordered that the animals should be isolated.