Did you know a common cold can kill a great ape? Why getting close to these primates can put them in danger

Humans and great apes are so genetically similar that these animals are at risk of catching diseases from us – to which they have no immunity.

• Can humans spread disease to wildlife?
• Do wild animals get cancer?

A study published in 2018 identified 33 known instances in which people had transmitted pathogens to chimpanzees, orangutans and gorillas, in captive, semi-wild and wild populations.

What diseases can humans pass on to great apes?

Diseases that can be passed onto great apes include respiratory conditions such as influenza, pneumonia and tuberculosis, and bacterial infections such as salmonella.

But even a seemingly unthreatening virus can have a devastating impact. In 2009, for example, 11 out of 12 mountain gorillas in Rwanda became sick after contracting the human metapneumovirus (which, for us, manifests as a common cold); of these, an adult female and an infant male died.

This is why mountain gorilla tourism rules specify that you should not approach closer than 7m if you’re wearing a mask; 10m if you’re not, and why time with any group is limited to just one hour.

• The world’s 25 most endangered primates