wild animals in cages many of them injured and weak it's filthy ancram of the animals are in close contact with humans . the corona virus may have started to spread in an animal market like this is the perfect breeding ground for new diseases. markets like this provide an opportunity for pathogens to make the leap from one species to another. in the process the pathogen can develop characteristics that make it easier to spread to a 3rd species in this case to humans. experts have long been warning that the trade in wild animals could be a ticking time bomb more than 2 thirds of infectious diseases that affect humans originated wildlife those include deadly diseases such as the ebola virus sauce and hiv aids scientists call such diseases as it were not it because they originate an animal's. zoonotic diseases can be dangerous because the pathogen can develop new capabilities in its new host the new host has no immunity so infection can often lead to serious disease and. the current a virus pandemic has thrust these wild animal markets into the spotlight around the world many are calling for