Have you thought about why they call them “wet” markets?

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I visited the Tai Po wet market in Hong Kong, and it's quite obvious why the term "wet" is used. Live fish in open tubs splash water all over the floor. The countertops of the stalls are red with blood as fish are gutted and filleted right in front of the customers' eyes. Live turtles and crustaceans climb over each other in boxes. Melting ice adds to the slush on the floor. There's lots of water, blood, fish scales and chicken guts. Things are wet.

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But researchers of zoonotic diseases — diseases that jump from animals to humans – pinpoint the wet markets in mainland China as particularly problematic for several reasons. First, these markets often have many different kinds of animals – some wild, some domesticated but not necessarily native to that part of Asia. The stress of captivity in these chaotic markets weakens the animals' immune systems and creates an environment where viruses from different species can mingle, swap bits of their genetic code and spread from one species to another, according to biologist Kevin Olival, vice president for research at the EcoHealth Alliance. When that happens, occasionally a new strain of an animal virus gets a foothold in humans and an outbreak like this current coronavirus erupts.

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