How humans are making pandemics more likely

Over the last 40 years, disease outbreaks among humans have become more and more frequent. The majority of those diseases are zoonoses, or diseases that originated in animals, like Ebola, West Nile virus, and probably Covid-19. But what makes zoonotic outbreaks likelier than ever is actually something humans are doing.

What role do animals play in the coronavirus pandemic? | COVID-19 Special

As the death toll of Covid-19 keeps rising, scientists are still uncertain about where this deadly virus came from in the first place. It's believed that it jumped from animals to humans. So far pangolins and bats that were sold at the wet market in Wuhan in China are the most likely candidates. But the virus doesn't stay with humans. There are signs that it's also spreading to other animals.