Shocking footage seen by MailOnline reveals the appalling state of Nigerian wet markets which have the potential to cause future disease outbreaks in humans. Myriad animals including pangolins, primates and sea turtles are held — both dead and alive — in confined spaces while workers fail to sanitise surfaces or tools and do not wear appropriate PPE, including gloves. Video also shows many of the animals being abused before they are slaughtered; photographic evidence reveals vendors boiling animals including pangolins, dogs and manatees while they are still alive. The Huanan Seafood Wholesale Market in Wuhan is believed to be the site of the first outbreak of SARS-CoV-2, the pathogen causing the Covid-19 pandemic. This is an example of zoonotic transmission where viruses jump from animals to people and experts warn bringing a wide range of animals into a small space alongside humans in unclean conditions is a perfect recipe for disease. Malcolm Bennett, Professor of Zoonotic and Emerging Disease at the University of Nottingham, told MailOnline: 'If you were to want to maximise the risk of zoonotic transmission you would mix human contact with a wide range of animals — domestic and wild — and bring them together both alive and dead in the same area.' Zoonotic diseases are not uncommon, with Covid-19, SARS, MERS, Ebola, HIV, the bubonic plague, rabies, West Nile virus and Lyme disease all originating in animals before infecting humans.