The world is grappling with the new coronavirus, which has spread from China to at least 15 other countries.

Outbreaks of new infectious diseases are typically seen as a "one off".

But the new virus - thought to have stemmed from wildlife - highlights our risk from animal-borne disease. This is likely to be more of a problem in future as climate change and globalisation alter the way animals and humans interact.

How can animals make people ill?
In the past 50 years, a host of infectious diseases have spread rapidly after making the evolutionary jump from animals to humans.

The HIV/Aids crisis of the 1980s originated from great apes, the 2004-07 avian flu pandemic came from birds, and pigs gave us the swine flu pandemic in 2009. More recently, it was discovered severe acute respiratory syndrome (Sars) came from bats, via civets, while bats also gave us Ebola.

Humans have always caught diseases from animals. In fact, most new infectious diseases come from wildlife.