The next time you see a cat doing what cats do i.e. munching on rodents, just leave it be. You might end up like this guy from Oregan who was infected with the Black Death. To brush up a bit on your medical history, this was the same disease that reduced Europe's population by as much as two-thirds during the 14th century.

According to Oregan Live, the man was bitten two weeks ago while attempting to rescue the mouse from the clutches of the stray cat. He is currently in critical condition and is being treated with antibiotics.

The black plague bacterium known as Yersinia pestis is typically transmitted through rodents who are bitten by carrier fleas. It's still unknown which animal was infected with the disease, but the cat (which has since died) has been sent to the CDC for analysis.