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You are here: Home / Coronavirus / Origin of Covid-19: industrial livestock?

Origin of Covid-19: industrial livestock?

April 7, 2020 by GRAIN 3 Comments

Let’s be clear: there is no solid evidence that the origin of the SARS-CoV-2 virus, which is the cause of the current Covid-19 disease pandemic, is an open seafood market in Wuhan that also trades in domestic and wild animals. All that we know is that several early cases of people diagnosed with Covid-19 either worked at this market or shopped there in the days preceding their diagnosis. Many media outlets and pundits have seized on this information to claim that Chinese wet markets and the live trade in domestic and wild animals are to blame for the emergence of the disease.[1] And some are even calling for a ban on wet markets— which are vital to the livelihoods and food security of millions of small farmers, traders and consumers.[2]

There is a growing body of evidence that points to a different origin story for Covid-19. We now know that none of the animals tested at the Wuhan seafood market tested positive and about a third of the initial set of reported cases in people in Wuhan from early December 2019 had no connection to the seafood market, including the first reported case .[3] [4] And we also now know, thanks to the leak of an official Chinese report to the South China Morning Post that the actual first known case of Covid-19 in Hubei was detected in mid-November, weeks before the cluster of cases connected to the Wuhan seafood market were reported.[5]

Last week, scientists at the Scripps Research Institute published a genomic sequencing analysis of the SARS-CoV-2 virus in the journal Nature that raises more doubts about the possibility of SARS-CoV-2 having originated at the Wuhan seafood market.[6]

The scientists conclude that SARS-CoV-2 evolved from natural selection and not genetic engineering in a lab, and they say that this natural selection occurred through two possible scenarios. One is that it evolved into its highly pathogenic form within humans. In this case, a less pathogenic form of the virus would have jumped from an animal to a human host and then would have evolved into its current form through an “extended period” of “undetected human-to-human transmission”. Under this scenario, there is no reason to believe that the Wuhan seafood market had anything to do with the evolution of the disease, even if it is quite possible that an infected person at the market could have transmitted it to others.

The second scenario fits with previous coronavirus outbreaks, in which humans contracted deadly coronaviruses after direct exposure to civets, in the case of SARS, and to camels, in the case of MERS. In this scenario, SARS-CoV-2 would have evolved to its present form in an animal host before transfer to humans. Like many other scientists, the Scripps researchers think that it is most likely that the initial transmission would have occurred from bats to an intermediate animal host, where the virus then evolved to its current form.

The Scripps researchers go on to say that the particular genetics of SARS-CoV-2 indicate that “an animal host would probably have to have a high population density (to allow natural selection to proceed efficiently) and an ACE2-encoding gene that is similar to the human ortholog,” which is what the SARS-CoV-2 virus binds to in humans.[7]

So which animals fit this criteria?

Another recently published study identifies the most likely intermediate animal hosts for SARS-CoV-2, based on their presence in Wuhan and their having a human-like ACE2 that enables the binding of SARS-CoV-2. These are the animals the study identified: civets, pigs, pangolins, cats, cows, buffalos, goats, sheep and pigeons.[8]

Many of the animals on this list are industrially farmed in China, even wild animals like civets and pangolins are intensively farmed for their use in Chinese medicines. Suspicions that wild animal farms may have been behind the Covid-19 outbreak have already led the Chinese government to shut down 20,000 wild animal farms across the country.[9]

But hardly any attention has been given to some other animals on this list, which more clearly meet the “high population density” criteria. Pigs would be one obvious candidate from this list, for several reasons.

For one, pigs and humans have very similar immune systems, making it easy for viruses to cross between the two species, as happened with the Nipah virus outbreak in Malaysia in 1998.[10] Indeed, just three years before the Covid-19 outbreak began, tens of thousands of pigs in four factory farms in Qingyuan county in Guangdong, less than 100 km from the site where the SARS outbreak originated in 2003, died from an outbreak of a new, lethal coronavirus strain (SADS) that turned out to be 98 percent identical to a coronavirus found in horseshoe bats in a nearby cave.[11] Luckily transmission to humans did not occur, but subsequent laboratory tests demonstrated that such transmission could have been possible.[12]

Hubei Province, where Wuhan is located, is one of the top five largest producers of pigs in China. Over the past decade, small pig farms in the province have been replaced by large factory farms and medium-sized contract operations, where hundreds or thousands of genetically-uniform pigs are confined in high density barns. These industrial farms are the ideal breeding grounds for the evolution of new pathogens.[13]

Hubei’s factory pig farms are still reeling from a massive outbreak of African swine fever that struck the province and other parts of China just over a year ago, wiping out up to half of the national herd.[14] In these conditions, it is entirely possible that an outbreak of a new coronavirus among pigs in the province could go unnoticed.

GRAIN and other organisations and scientists have been raising the alarm for over a decade now about how the industrialisation and corporate consolidation of meat production has generated increased risks for the emergence of global pandemics such as Covid-19.[15] But this reality has been completely ignored by governments and the big meat companies they are beholden to. As noted by evolutionary biologist Rob Wallace, “Anyone who aims to understand why viruses are becoming more dangerous must investigate the industrial model of agriculture and, more specifically, livestock production. At present, few governments, and few scientists, are prepared to do so.”[16] With the growing carnage from Covid-19, a radical change in direction is more urgent than ever.

 

This post originally appeared on the GRAIN website.

Photo: William James Topley (Public Domain)

 

 

[1] Therese Shaheen, “The Chinese Wild-Animal Industry and Wet Markets Must Go”, National Review, 19 March : https://www.nationalreview.com/2020/03/the-chinese-wild-animal-industry-and-wet-markets-must-go/

[2] “Fresh markets are not to blame for the new corona virus outbreak”, GRAIN, 27 February : https://grain.org/e/6413

[3] Carolyn Kormann, “From Bats to Human Lungs, the Evolution of a Coronavirus”, The New Yorker, 27 March : https://www.newyorker.com/science/elements/from-bats-to-human-lungs-the-evolution-of-a-coronavirus

[4] Jon Cohen,”Wuhan seafood market may not be source of novel virus spreading globally”, Science Magazine, 26 January : https://www.sciencemag.org/news/2020/01/wuhan-seafood-market-may-not-be-source-novel-virus-spreading-globally

[5] Jeanna Bryner, “1st known case of coronavirus traced back to November in China”, Live Science, 14 March : https://www.livescience.com/first-case-coronavirus-found.html

[6] Kristian G. Andersen, Andrew Rambaut, W. Ian Lipkin, Edward C. Holmes & Robert F. Garry, “The proximal origin of SARS-CoV-2”, Nature Medicine, 17 March: https://www.nature.com/articles/s41591-020-0820-9

[7] The Scripps Lab website is here : https://andersen-lab.com/

[8] Ye Qiu,Yuan-Bo Zhao, Qiong Wang, Jin-YanLi, Zhi-Jian Zhou, Ce-Heng Liao, Xing-YiG, “Predicting the angiotensin converting enzyme 2 (ACE2) utilizing capability as the receptor of SARS-CoV-2”, Science Direct, 19 March: https://www.sciencedirect.com/science/article/pii/S1286457920300496

[9] Coronavirus closures reveal vast scale of China’s secretive wildlife farm industry”, The Guardian, 25 February : https://www.theguardian.com/environment/2020/feb/25/coronavirus-closures-reveal-vast-scale-of-chinas-secretive-wildlife-farm-industry

[10] Stephen P. Luby, Emily S. Gurley, and M. Jahangir Hossain, “Transmission of human infection with Nipah virus”, National Center for Biotechnology Information, 2 November 2009 : https://www.ncbi.nlm.nih.gov/books/NBK114486/

[11] “How China’s “Bat Woman” Hunted Down Viruses from SARS to the New Coronavirus”, Scientific American, 11 March: https://www.scientificamerican.com/article/how-chinas-bat-woman-hunted-down-viruses-from-sars-to-the-new-coronavirus1/

[12] Yong-Le Yang, Pan Qin, Bin Wang, Yan Liu, Guo-Han Xu, Lei Peng, Jiyong Zhou, Shu Jeffrey Zhu, Yao-Wei Huang, “Broad Cross-Species Infection of Cultured Cells by Bat HKU2-Related Swine Acute Diarrhea Syndrome Coronavirus and Identification of Its Replication in Murine Dendritic Cells In Vivo Highlight Its Potential for Diverse Interspecies Transmission” Journal of Virology – American Society for Microbiology, 26 November 2019: https://doi.org/10.1128/jvi.01448-19

[13] “Building a factory farmed future, one pandemic at a time”, GRAIN, 3 March : https://www.grain.org/en/article/6418-building-a-factory-farmed-future-one-pandemic-at-a-time

[14] ibid.

[15] “Viral times – The politics of emerging global animal diseases”, GRAIN, 20 January 2008 : https://grain.org/e/614

[16] “Capitalist agriculture and Covid-19: A deadly combination”, Climate and Capitalism, 11 March: https://climateandcapitalism.com/2020/03/11/capitalist-agriculture-and-covid-19-a-deadly-combination/

 

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Filed Under: Coronavirus, Food and Farming Tagged With: agriculture, corporations, farming, global food, health, industrial agriculture

Author: GRAIN

GRAIN is a small international non-profit organisation that works to support small farmers and social movements in their struggles for community-controlled and biodiversity-based food systems. More info on their website, www.grain.org

Comments

  1. Laura Tyley says

    April 8, 2020 at 10:03 pm

    Interesting read. Thanks for sharing!

    Reply
  2. Alex Mitchell says

    April 9, 2020 at 1:09 am

    This is a very speculative piece that feeds on ifs, maybes and huge leaps in assumptions and that is makes a nice story as opposed to any evidence. The actual hypothesis of the article only cites news sources, many of which are from yourselves or already slanted news outlets such as the Guardian.

    Yes, livestock can transmit disease to humans and vice versa, but we must be thorough in testing and researching this before potentially alarming and misleading the public. Humans can also pick up diseases and illness from plant based sources, such as ergot (bread), salmonella (cucumbers) and listeria (salads) – animal and plants based disease spread have been part of human existence since its inception.

    To make inferences that livestock farming is to blame makes you no better than those trying to pin the whole affair on 5G. All the science so far as categorically refuted any link to livestock https://www.biorxiv.org/content/10.1101/2020.03.30.015347v1.full.pdf

    Anything else is speculation. Also, my understanding of recent pig disease in China is that the main vectors are transport and human spread, and the poor biosecurity of backyard keepers who feed their animals on discarded food waste or who work in pig sectors themselves, transmitting the disease from one unit to another.

    In times like these, such articles do no help to anyone. Please be more responsible.

    Reply
    • Local Futures says

      April 10, 2020 at 12:54 am

      This response from the authors at GRAIN:

      Our article does not claim to any definitive scenario for the origin of Sars-Cov-2. All theories are speculative at this point, and our article is primarily a response to the claim, widely repeated in the mainstream media, that the origin of the virus is from wild animals sold at a Wuhan wet market. We cite multiple, recent scientific articles and other articles that are based on scientific articles to support our assertions. The non-peer reviewed paper published recently by biorxiv is not “categorical” proof that there is no link to livestock and farmed animals, and, as we state clearly in our article, further investigation of links to pigs and other farmed animals require further investigation. There is, however, abundant proof of the negative impacts of industrial animal farming on human health, including its role in the development and transmission of lethal pathogens.

      The ongoing African Swine Fever epidemic that is affecting Eastern Europe and Asia is directly connected to the expansion of industrial pig farming. Please see our recent report on this disease for more information: https://grain.org/e/6418

      Reply

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