The star, who recently called for all wet markets to be shut, made the comment in a recent Instagram video to his 759,000 followers.
'Humans are to blame'
"Us humans are to blame for this Covid-19 s**t, and until we wake up and stop taking from the animal kingdom, these viruses are gonna keep coming and nature will have its pandemic way," Adams captioned the post.
"Lookup any of the pandemics in the past 1,000 years, even the bubonic plague* is said to have come from Asia and from animals."
He also urged his followers to read an article he shared on Twitter about 'factory farming and the correlation between them and this virus' - which he dubbed 'sickening'.
Covid-19 is believed to have originated from a wet market, where live animals are slaughtered and sold alongside dead ones, in Wuhan, China, towards the end of last year. The global death toll is more than 203,000 at the time of writing.
Adams isn't the only vegan celebrity to point out the correlation. Actors Joaquin Phoenix and Rooney Mara penned an Op-Ed for The Washington Post blasting factory farms for 'breeding contagions like the coronavirus'.
"Less notorious [than wet markets] but much more commonplace threats to public health are the 'concentrated animal feeding operations' (CAFOs) scattered throughout the South and Midwest," the pair wrote.
"These factory farms warehouse thousands of animals that wallow in their own waste with limited or no airspace, routinely creating conditions for the proliferation of superbugs and zoonotic pathogens."
*According to the World Health Organization (WHO) - bubonic plagues are caused by the bacteria Yersinia pestis, a zoonotic bacteria, usually found in small mammals and their fleas. It is transmitted between animals through fleas and can infect humans.