Melioidosis, a bacterial infection, was responsible for killing at least nine monkeys at a Hong Kong zoo, authorities said, as a further two died over the weekend, taking the total to 11 in the past week.

Three of the monkeys that died at the Hong Kong Zoological and Botanical Gardens are a critically endangered species

Nine monkeys who died in Hong Kong’s oldest zoo in two days this week had been infected with an endemic disease, possibly after some digging work near their cages, officials said on Friday.

Nine monkeys who died in Hong Kong's oldest zoo in two days this week had been infected with an endemic disease, possibly after some digging work near their cages, officials said on Friday.

Hong Kong authorities are carrying out tests to find out what killed eight monkeys, which were found dead in the city’s oldest zoo on Sunday, the government said on Monday.

Hong Kong’s oldest zoo is seeking answers in a monkey medical mystery after nine animals died in two days, including three members of a critically endangered species.

The zoo partially closed after the deaths, which occurred over two days and included members of a critically endangered species.

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.

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. The death toll rose to 11 over the weekend after two more monkeys died.