The death of nine monkeys over two days at a zoo in Hong Kong is believed to have been caused by a bacterial infection, the city’s authorities said.

A 12th monkey has died at a Hong Kong zoo, authorities said late on Tuesday, after 11 monkeys died in the past week due to Melioidosis, a bacterial infection, which can affect both humans and animals.

A twelfth monkey has died at a Hong Kong zoo, with tests underway to determine if it succumbed to the same bacterial infection that killed 11 other monkeys in the past 10 days. The De Brazza's monkey had been isolated since 13 October when the first eight deaths were reported.