It's not a secret that rats carry diseases, they quite literally carried the pests that caused the Bubonic Plague across Europe in the middle ages. But New York City has always felt like their rats were exceptional compared to rats beyond the Hudson River, and so scientists at Columbia University's Mailman School of Public Health trapped 133 Norway rats at 5 sites in New York City, focusing on rats trapped inside residential buildings.
They examined them for identified bacterial pathogens, including E. coli, Salmonella, and C. difficile, that cause mild to life-threatening gastroenteritis in people; Seoul hantavirus, which causes Ebola-like hemorrhagic fever and kidney failure in humans; and the closest relative to human hepatitis C.