The outbreak of a new virus linked to a wildlife market in central China is prompting renewed calls for enforcement of laws against the trade in and consumption of exotic species.

It's also raising questions about how it could happen again after the lessons learned from the 2002-2003 outbreak of SARS, or Severe Acute Respiratory Syndrome, which was traced to consumption of wild animals in the southern city of Guangzhou.

Demand for wild animals in Asia, especially China, is hastening the extinction of many species, on top of posing a perennial health threat that authorities have failed to fully address despite growing risks of a global pandemic.

In response to the crisis that has been centered in the big industrial city of Wuhan, China's Agriculture Ministry issued an order earlier this week for tightened controls on trade in wildlife.

A group of 19 prominent researchers from the Chinese Academy of Sciences, the Wuhan Institute of Virology and the nation's top universities are calling for the government in China to crack down on wildlife markets such as the one at the centre of the Wuhan outbreak.

Coronavirus: Cases soar of deadly new flu-like virus Show all 154 1 /154 Coronavirus: Cases soar of deadly new flu-like virus Coronavirus: Cases soar of deadly new flu-like virus Paramedics wearing personal protective equipment carry patient on a stretcher on to an ambulance in North Point district in Hong Kong, China Getty Images Coronavirus: Cases soar of deadly new flu-like virus A medical worker wearing protective gear takes a rest as he waits for ambulances carrying patients infected with the COVID-19 coronavirus at an entrance of a hospital in Daegu, South Korea YONHAP/AFP via Getty Images Coronavirus: Cases soar of deadly new flu-like virus A medical worker sprays disinfectant on an ambulance after carrying a patient infected with the COVID-19 coronavirus at a hospital in Daegu YONHAP/AFP via Getty Images Coronavirus: Cases soar of deadly new flu-like virus People wearing protective face masks shop at a supermarket in Casalpusterlengo, one the northern Italian towns placed under 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Illegal trade flourishes in “loopholes” of the legal wildlife trade in China and increases the probability of an outbreak, the group wrote in an open letter posted on Weibo. “This is the hidden danger for the trade and consumption” of wild animals, the letter read. They advocate vastly increasing on-site inspections and government oversight of all wildlife markets.

The New York-based Wildlife Conservation Society, meanwhile, appealed for an end to wildlife markets everywhere, not just in China.

Zoonotic diseases, or those contracted by humans that originated in other species, account for a large share of human infectious illnesses. Not all of them come from the wildlife trade: rabies is endemic across many species and one of the biggest causes of death in the developing world. But mixing species of wild animals increases the risk of diseases mutating and growing more virulent as they spread in unregulated markets, experts say.

The emergence of such diseases is a “numbers game,” said Christian Walzer, executive director of the Wildlife Conservation Society's health program.

“If these markets persist, and human consumption of illegal and unregulated wildlife persists, then the public will continue to face heightened risks from emerging new viruses, potentially more lethal and the source of future pandemic spread,” Mr Walzer said. “These are perfect laboratories for creating opportunities for these viruses to emerge.”

The order issued by the Ministry of Agriculture and Rural Affairs, dated Jan 21 banned all shipments of wild animals out of Wuhan. It also called for stepped up inspections and for raising public awareness about the risks of eating them.

Researchers have not yet announced a definitive source for this latest outbreak, which like many other viruses can infect multiple species.

One of the first measures taken by Wuhan authorities was to close down the Huanan Seafood Wholesale Market, where 41 of the first cases originated.

Items seized from a store suspected of selling trafficked wildlife are seen in Anji city in eastern China's Zhejiang Province (Anti-Poaching Special Squad/AP)

“That's the big black box right now,” said Jon Epstein, an epidemiologist with the Ecohealth Alliance.

He was in China following the SARS outbreak and helped the ongoing global effort over nearly two decades to find the wild source of that virus, which sickened more than 8,000 and killed less than 800. SARS has been linked to various animals, including bats and the cat-like masked palm civet.

Bats are known to harbour coronaviruses, but scientists have yet to fully understand the new virus and how it leapt from animals to people.

Dr Epstein said researchers suspect but haven't proven that the Wuhan virus came from bats. Before it infected humans, it likely first jumped to an as yet unidentified mammal.

“There's no plausible evidence to support snakes being involved with this virus,” Dr Epstein said, referring to recent media speculation criticised by a recent article in Nature. Researchers don't know which species exactly were sold in the Wuhan market, but Dr Epstein said mammals commonly found in such markets—such as ferret badgers, racoon dogs or civets—might be involved in the transmission of the new virus to people.

The crackdown on wildlife trafficking and sales persisted only about six months after the SARS outbreak faded in mid-2003, Mr Walzer said.

“The solution is simple,” he said. “In the sense that we know where the problem is.”

In cities like Beijing, Shanghai and Hong Kong, there's little sign of markets catering to gourmands seeking “ye wei,” or “wild flavours.”

But in provincial cities and in some parts of Laos, Vietnam, Cambodia and other Southeast Asian countries, those determined to eat such exotic dishes can find all sorts of creatures for sale: pangolins, badgers, salamanders, scorpions, hedgehogs and even wolf puppies.

A photo of a menu list from a vendor in the Wuhan market called “Wild Game Livestock for the Masses,” circulated online, showed more than 110 species for sale.

Court records show that authorities in Hubei, the province where Wuhan is located, investigated 250 cases related to wildlife trafficking and poaching in 2019 alone. According to local media reports, since 2018 an estimated 16,000 wild animals were hunted in the province of more than 60 million people.

Hubei is home to Shennongjia, a UNESCO World Heritage nature reserve that is a habitat of great biodiversity with many rare species including the clouded leopard, golden snub-nosed monkey and the Chinese giant salamander.

Video footage filmed by a conservation activist in eastern China's Zhejiang and Anhui provinces, which also have a long tradition of consuming wild species, showed many wild species laid out for inspection in a market.

In most cases, vendors are registered to sell some unprotected species, usually a limited amount of just a few, such as hares, wild boar and muntjac, a kind of tiny deer.

But enforcement is “not that strict,” said Tian Jiang Ming of the Anti-Poaching Squad, a group of volunteers who visit markets are report on illegal wildlife sales. The illegal offerings tend to be kept hidden away in back freezers, he said.

“The vendors are selling illegally poached animals with these licenses in hand,” he told The Associated Press.

Only in 2014 did China criminalise consumption of protected species with a law specifying a maximum three-year jail term. But it also has allowed commercial farming of certain species, including tigers — a practice that conservation advocates say encourages illicit trafficking in protected species.

It's difficult to secure prosecution since it's hard to prove animals have been poached, Tian Jiang Ming said.

“The forestry department needs to prove illegal poaching by the sellers but they don't have the investigative resources to find them,” he said.