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COVID-19 pandemic and animals

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Dogs are capable of becoming infected with COVID-19. They are also capable of cheering up lonely caretakers during lockdowns.

The COVID-19 pandemic has affected animals directly and indirectly. SARS-CoV-2, the virus that causes COVID-19, is zoonotic, which likely to have originated from animals such as bats and pangolins.[1][2][3][better source needed] Human impact on wildlife and animal habitats may be causing such spillover events to become much more likely.[4][5] The largest incident to date was the 2020 Danish mink cull, the slaughter of all 17 million mink in Denmark after it was discovered that they were infected with a mutant strain of the virus.[6][7]

While research is inconclusive, pet owners reported that their animals contributed to better mental health and lower loneliness during COVID-19 lockdowns.[8][9] However, contact with humans infected with the virus could have adverse effects on pet animals.[10]

Background

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Main article: Investigations into the origin of COVID-19

SARS-CoV-2 is believed to have zoonotic origins and has close genetic similarity to bat coronaviruses, suggesting it emerged from a bat-borne virus.[11][12][13][14][better source needed]

Cases

[edit]

A small number of pet animals have been infected. There have been several cases of zoo animals testing positive for the virus, and some became sick. The virus has also been detected in wild animals.

Cats, dogs, ferrets, fruit bats, gorillas, pangolins, hamsters, mink, sea otters, pumas, snow leopards, tigers, lions, hyenas, hippos, tree shrews and whitetail deer can be infected with and have tested positive at least once for the virus.[3] According to the US Centers for Disease Control and Prevention, the risk of transmission from animals to humans and vice versa is considerably low but further studies are yet to be conducted.[3] Mice were initially unsusceptible but researchers showed that a type of mutation (called aromatic substitution in position 501 or position 498 but not both) in the SARS-CoV-2 virus spike protein can mouse-adapt the novel Coronavirus.[15] Some animals which were only thought to have been susceptible at low levels were later found to have experienced higher levels of infection than previously realized, either due to viral mutations or improved surveillance technology. Dogs, for instance, showcased low levels of infection or transmission early in the pandemic, but were later found to have experienced potentially elevated levels of asymptomatic infections.[16] As wild-life animals has been found to be infected with the virus, some wildlife species have benefited from the viral outbreak in ways where they can find new habitats due to reductions of outdoor human interactions.[17]

Animal deaths due to the disease are confirmed to have occurred on numerous occasions, with some species, such as mink, being particularly vulnerable and experiencing high mortality rates.[18][19][20]

Asiatic lions

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The Nehru Zoological Park reported that eight Asiatic lions have contracted the virus. The samples were taken on 24 March 2021, after the lions showed signs of respiratory distress.[21]

Avian crossover

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In the summer of 2022, two cases of SARS-CoV-2 infection were reported in swans within China. Raj Rajnarayanan, assistant dean of research at New York Institute of Technology, hypothesized that Omicron variants were better primed to infect poultry such as chicken and turkeys when compared to the Delta variant.[22]

Deer

[edit]
Main article: SARS-CoV-2 in white-tailed deer

North American white-tailed deer have evidenced widespread SARS-CoV-2 infection over the course of the pandemic, together with smaller numbers of infections detected within North American mule deer and, outside of the Americas, within European fallow deer.[23][24]

SARS-CoV-2 or its antibodies have been regularly detected in white-tailed dear across at least 15 US states, and one Canadian province, potentially forming a natural reservoir of the virus.

In August 2021, the U.S. National Veterinary Services Laboratory confirmed SARS-CoV-2 in wild white-tailed deer in the state of Ohio.[25][26]

In January 2022, the Canadian Food Inspection Agency's National Centre for Foreign Animal Disease confirmed SARS-CoV-2 in wild white-tailed deer in the province of Ontario.[27]

November 2021

[edit]
Test results of 624 prepandemic and intrapandemic serum samples from wild deer from four states of the U.S.[28]

In November 2021, a Pennsylvania State University pre-print report awaiting peer review was reported on by news sources. The researchers tested roadkill and hunter-killed deer in Iowa between April 2020 and January 2021. They said that they found that up to 80% were infected.[26] CNN has reported that SARS-CoV-2 antibodies were detected in deer Illinois, Michigan, New York and Pennsylvania.[29]

Canada's Environment and Climate Change Department announced that SARS-CoV-2 was detected in wild white-tailed deer in Quebec.[30]

A study published on 23 November 2021 indicates that large proportions of the wild deer population in the U.S. have been infected with SARS-CoV-2. The test results showed one "mismatch" in 2019, low inhibition values in 2020 and 152 positive samples (40% having antibodies) in 2021.[28]

It has been pointed out that such reverse zoonosis spillovers may cause reservoirs for mutating variants that could spill back to humans – a possible alternative source for variants of concern in addition to immunocompromised people.[26]

Non-Human Great Apes

[edit]

General Non-human Great Ape Susceptibility to COVID-19

Although the susceptibility of COVID infection among many non-human primates is unknown, all catarrhines, monkeys and apes from Africa and Eurasia, have the same set of 12 amino acid residues as human ACE2 where SARs-COVID enters the host cell leading to infection. American monkeys, lemurs, and lorises usually exhibit different amino acid contact residues which results in lowered modeled susceptibility of contracting COVID. SARS-COVID exhibits a high degree of binding affinity to the ACE2 receptor which is the virus’s primary entry point into a host cell. Given the high degree of conservation of the ACE2 receptor among catterhines, they suggest that their results imply a high likelihood that all African and Asian primates are susceptible to infection by SARs-COVID.[31]

Non-Human Great Apes

[edit]

General Non-human Great Ape Susceptibility to COVID-19

Although the susceptibility of SARS-CoV-2 infection among many non-human primates is unknown, all catarrhines, monkeys and apes from Africa and Eurasia, have the same set of 12 amino acid residues as human ACE2 where SARS-CoV-2 enters the host cell leading to infection. American monkeys, lemurs, and lorises usually exhibit different amino acid contact residues which results in lowered modeled susceptibility of contracting COVID. SARS-CoV-2 exhibits a high degree of binding affinity to the ACE2 receptor which is the virus’s primary entry point into a host cell. Given the high degree of conservation of the ACE2 receptor among catterhines, they suggest that their results imply a high likelihood that all African and Asian primates are susceptible to infection by SARS-CoV-2.[31]

Gorilla

Initially a January 2021 outbreak in the San Diego Zoo was documented as the first case of non-human primates contracting COVID-19. The confirmation of at least two of the eight gorillas in the troop testing positive for COVID-19 became a notable news story at the time.[32] However, since then there has been further testing showing two gorillas in a Spanish zoo testing positive for COVID-19 as early as early April 2020. One of the gorillas started displaying symptoms in early April, infecting at least one other gorilla which remained asymptomatic. The symptomatic gorillas had recently transferred from the UK, where they likely contracted COVID-19 during transfer as a result of improper usage of personal protective equipment by staff.[33]

A similar case to the Spanish zoo occurred at the Rotterdam Zoo in November 2021. The facility’s zookeepers noticed a few gorillas starting to cough, and within days all seven gorillas inside of the enclosure were tested positive for COVID-19. While an eighth gorilla remained negative for COVID-19 as a result of being housed in a separate enclosure during this time. Several of the gorillas displayed signs of Covid infection similar to humans of respiratory issues, lethargy and reduced food intake. The infection of the gorilla troops was likely a result of improper testing techniques of zookeeper staff and/or improper use of personal protective equipment by staff.[34]

Although there has been no noted infections among the mountain gorilla populations, Gorilla beringei, the confirmed infection of the western lowland gorillas leads conservationists and researchers to believe they are similarly susceptible to infection. As a result of proper usage of personal protective equipment, proper screening, and the maintaining of distance between tourists, researchers, conservationists, and the mountain gorillas, not only have COVID-19 cases not been seen, other infectious respiratory diseases have become less common. Infection of human originating diseases, such as measles, has consistently been one of the major causes of illness and death among the endangered mountain gorillas. Researchers and conservationists urge the continued usage of personal protective equipment, pathogen screening, and maintaining physical distance to continue preventing human-gorilla disease transmission.[35]

The improper usage of personal protective equipment by researchers and zookeeper staff is the most common method of transmission of COVID-19 from humans to gorillas. Properly using personal protective equipment is one of the best ways to prevent COVID-19 and other transmittable diseases from infecting gorillas in captivity and the wild.

Chimpanzees and Bonobos

There have been recorded cases of wild chimpanzees contracting different forms of coronavirus, such as a late 2016 to early 2017 minor outbreak of HCoV-OC43 among a community of 33 chimpanzees in Taï National Park in Côte d´Ivoire where most members of the group exhibited mild symptoms of sneezing and coughing in the mornings.[36] However, there has yet to be confirmed cases of members of the Pan genus, chimpanzees and bonobos, either in the wild or captivity becoming infected with COVID-19 since the beginning of the pandemic.


Orangutans

Like all other apes, there is a possibility that orangutans are susceptible to infection by COVID-19. However, like chimpanzees and bonobos there have yet to be confirmed cases of infection in either captive, wild, or translocated individuals. In the case of infection, transmission from one orangutan to another in the wild is relatively low as a result of orangutans’ semi-solitary lifestyle. Regardless, most people working with orangutans maintain the usage of personal protective equipment, as well as regular testing in order to further lower the chance of transmission of COVID-19, or other human originating diseases, to orangutans.

Translocation has been historically one of the largest risk points for the infection of great apes with human originating diseases, and then spreading them to new captive or wild populations. However, since the beginning of the COVID-19 pandemic the enforcement of personal protective equipment, screening for COVID-19 and other diseases, and vaccinated staff has lowered the potential disease transmission from humans to wild orangutan populations.[37]

Hamsters

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In January 2022, a cull of hamsters was announced in Hong Kong. Some 2,000 animals have been expected to be killed after a worker in a pet shop tested positive for the virus, which was also found among the pets. Conscious of the virus' ability to spread among hamsters,[38] and the possibility of transmission between species, in line with the territory's 'zero covid' policy, the cull was invoked.[39]

Marine mammals

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Susceptibility

[edit]

SARS-CoV-2, the virus that causes COVID-19, is typically transmitted through droplets found in breaths, coughs, sneezes, etc. However, recent research shows that the virus can also be transmitted to the marine environment through stool and urine from infected individuals.[40] The virus can also be passed to the oceans through improper disposal of personal protective equipment containing live virus.[41] Marine mammal susceptibility to SARS-CoV-2  has been a topic of concern as there have been past recorded cases of alphacoronavirus and gammacoronavirus in this species.[42] Specifically, studies have been conducted to determine susceptibility using the ACE2 enzyme, the cellular receptor for COVID-19.[40][42] Studies show that variations of the ACE2 enzyme can either increase or decrease the vulnerability of the mammal to contract the virus, depending on if the mutation strengthens or weakens the bonding affinity of the virus to the enzyme.[40] The findings concluded that the most vulnerable mammals include several cetaceans, pinnipeds, and some sea otter species, with some species predicted to have higher than human susceptibility.[40] Unfortunately, many of the species at high or moderate risk of the virus are already classified to be endangered or threatened, such as the Amazon River Dolphin, the Northern sea otter, and many others.[40]

Impact of personal protective equipment (PPE) pollution

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Along with the threat of virus entry to the ocean and infection of marine mammals through wastewater treatments, the increased use and improper disposal of personal protective equipment and disinfecting materials poses a great threat to marine mammal wellbeing. Since the pandemic began, the worldwide use of single use masks, hand sanitiser, and other personal protective equipment such as face shields, medical gloves, etc. has surged immensely.[43] This has caused a substantial build up of pollution in the Earth's oceans. This poses a threat to marine mammals as much of the personal protective equipment used during the pandemic is composed of plastic-based materials that do not easily decompose in a natural environment.[43] These plastic polymers can be and are easily mistaken for a source of food of marine mammals and directly consumed, cause entanglement, or suffocation, all of which can result in damage or death to the mammal species.[44] The use of disinfectants as person protective equipment also threatens the marine mammal ecosystem in a significant way.[42] Many of these disinfectants contain chlorine in their main chemical composition, which in itself is a toxic compound.[42] When chlorine enters the seawater on items such as lysol wipes, hand sanitizers, and various other disinfectants, it reacts chemically to produce halogenated compounds that are toxic to marine biota.[42] This can create either a direct threat to marine mammals due to toxicity, or it can deplete the populations of prey of marine mammals, leaving them vulnerable to starvation.

Wastewater transmission of SARS-CoV-2 in the marine environment

SARS-CoV-2 has been proven to infect the intestinal tract of many patients. Due to its presence in the intestinal tract, it is subject to viral shedding via feces, creating another medium of transmission.[45] Studies have shown the presence of the virus in stool and urine samples of infected patients. This is of high concern due to the potential spreading of virus through untreated wastewater. Once released to an open water system, the virus can survive and disperse quickly. Domestic wastewater systems among Australia, France, Italy and Spain have been found to contain traces of the virus and are vulnerable to it being a form of transmission.[45] The detection of the virus in sewage can thus be a viable early warning method for tracking the concentration of the virus. The ability to detect the virus and its abundance in a given location is important to help mitigate its transmission in the surrounding areas and to marine life.[45] Treatment plans typically involve three procedures. Primary treatment relies on the settling of settleable solids but when used alone it is not an effective way of inhibiting contamination. Secondary treatment involves biological implementation that is applied to remove the settled solids and organic matter from the first step. Tertiary treatment uses additional processes to decrease the amount of nutrients and pathogens.[45] Non-treated and primary-treated wastewater are most at risk for carrying and transmitting SARS-CoV-2. Countries such as Ecuador with poor sanitization mechanisms are in danger of having their sewage systems becoming a source of the virus.[45] The presence of the virus in an open water system creates susceptibility of virus contraction in the marine mammal populations and can thus continue the pandemic from terrestrial to the marine environment.

Change in marine mammal behaviour due to decreased human activity

Due to the reduction in human activity during the pandemic, many marine species were documented to have increased sightings around the globe. This does not indicate an increase in population sizes, however reflects the change in animal behaviour due to the lack of human disturbance.[46] Specifically looking at marine mammals, a non-systematic review of wildlife sightings in online media news worldwide displayed the 27% increase in their sightings from March 17-June 11, 2020.[46] Human-activity examples that could have affected the increase in these sightings include the reduction of accidental death or injury due to boat collisions, decreases in maritime traffic that causes noise pollution, and an expansion in the habitat in which to live. The sightings included very strikingly visible marine mammals such as baleen whales, dugongs, manatees, dolphins and orcas.[46] These mammals were remarkably noticed due to their size and presence in unexpected areas. An example of this would be the sighting of an animal where there are typically high levels of tourism. The lack of human disturbances explain this phenomenon because it has allowed the animals to migrate outside their typical boundaries. Many marine mammals rely on echolocation which allows them to communicate with others and determine migration routes. Without as much noise pollution and boat traffic, this would have given these animals a chance to travel uninterrupted. The effects of their presences in new areas is yet to be determined as positive or negative, but their change in behaviour is of great significance.

Mink

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Main article: SARS-CoV-2 in mink
Further information: 2020 Danish mink cull and Cluster 5
White mink on a farm in Poland

Cluster 5, a variant of SARS-CoV-2, was found in mink populations and some employees in North Jutland, Denmark in early November 2020. The Danish government ordered the cull of all the country's estimated 17 million mink as a preventive measure.[47][48] In December 2020 a wild mink in Utah was discovered to be infected with COVID-19, confirmed by the U.S. Department of Agriculture.[49]

Opossums

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Samples taken from a wild Virginia opossum in 2022 revealed a unique mutation not found circulating in humans, suggesting animal-to-animal spread or viral evolution within the singular opossum.[50]

Snow leopards

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An unvaccinated 9-year-old male snow leopard at the San Diego Zoo tested positive for the coronavirus in late July 2021. The staff noticed the leopard had a cough and a runny nose. The caretakers confirmed the diagnosis with two separate stool tests.[51]

In other zoos, COVID-19 has killed snow leopards. In November 2021, three snow leopards died at a zoo in Nebraska, and in January 2022, a snow leopard died at a zoo in Illinois.[52]

Human–animal interaction

[edit]

Reduced human presence has the potential to bring both relief and disruption to different animal habitats. It may lead to more poaching of endangered wildlife.[53] Wild animals have been observed relaxing their avoidance of human habitats while COVID-19 lockdowns are in effect.[54] Instances have been observed of severe plagues of mice co-occurring with mouse-adapted SARS-CoV-2 virus variants circulating.[15] Studies were conducted to measure the wildlife activity and human interaction where animal activity was shown to increase as human disturbance has decreased significantly.[17] Some studies showed that, for example, urban birds might be highly resilient to the changes in human activity driven by the COVID-19 lockdowns.[55]

Decreased roadkill incidence has been reported during lockdowns, including a significant decrease in roadkill deaths for mountain lions in California.[56]

See also

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References

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