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6:36 AM 6/23/2020 – Wildlife trade amplifies spread of coronaviruses, two studies find | Six known coronaviruses found in wildlife in Vietnam


Wildlife trade amplifies spread of coronaviruses, two studies find | 
Six known coronaviruses found in wildlife in Vietnam

https://covid-19-review.blogspot.com/2020/06/636-am-6232020-wildlife-trade-amplifies.html

Michael Novakhov – SharedNewsLinks℠ | InBrief | 

Michael Novakhov – SharedNewsLinks 
Wildlife trade amplifies spread of coronaviruses, two studies find
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Michael Novakhov – SharedNewsLinks 
Wildlife trade amplifies spread of coronaviruses, two studies find

Michael_Novakhov shared this story .

Asias booming wildlife trade is fuelling the spread of coronaviruses by providing the ideal opportunity for animals to infect each other and potentially humans, two studies have found.
Across Asia, wild animals including rodents, pangolins and bats are transported, often illegally, thousands of miles in crowded and chaotic conditions for use in restaurants and traditional medicines.
Experts have long thought this amplifies the transmission of coronaviruses, making the possibility of a jump to humans more likely.
In one new study, published as a preprint without peer review, researchers analysed oral swabs from more than 2,000 field rats in three provinces in southern Vietnam. They found that the animals smuggled across the Mekong River Delta, from traders to restaurants, tested positive for six different coronaviruses. More significantly, the incidence of infection increased significantly along their journey.
Roughly 20 per cent of wild rats caught by traders tested positive for at least one coronavirus, rising to 32 per cent of rodents in large markets. In restaurants, the final step in the chain, 55 per cent of rats were infected.
The observed viral amplification along the wildlife trade supply chain for human consumption likely resulted from the mixing and close confinement of stressed live animals, the researchers wrote.
They added that the results demonstrate that human behaviour that is driving spillover events, where viruses jump from animals to people, and said added disease surveillance systems are needed.
To minimise the public health risks we recommend precautionary measures that restrict the killing, commercial breeding, transport, buying, selling, storage, processing and consuming of wild animals, researchers said.
Rodents are a popular item on the menu across southeast Asia and China, where they are viewed as a healthy and nutritious food source. Rats are regularly bought and sold in wet markets along the Mekong Delta in southern Vietnam, where the study took place.
Little concrete data is available on the scale and scope of the current market, but in the early 2000s between 3,300 and 3,600 tons of live rats were estimated to be processed in the Vietnamese field rodent trade. The study notes that the market was then valued at $2 million.
The data in the latest report was collected between 2013 and 2014, long before Covid-19 emerged, in a study led by the Wildlife Conservation Society.
Researchers also took fecal samples from animals on 28 wildlife farms  six per cent of both Malayan porcupines and of bamboo rats tested positive for coronaviruses, while 75 per cent of bats on bat farms were infected. The flying mammals are generally considered the natural reservoir of coronaviruses.
In a separate study, also published as a preprint on the website bioRxiv, researchers took samples from nearly 300 pangolins seized in Malaysia over a 10-year period. The critically endangered animal is one of the most trafficked mammals in the world their scales are used in traditional medicines, while pangolin meat is deemed an expensive delicacy. 
But while scientists detected Sars-Cov-2 in pangolins in February, none of the animals in this study, led by the Eco Health Alliance, tested positive. The report suggests this contrast i