Earlier, two viral tests conducted by the Hong Kong Agriculture, Fisheries and Conservation Department (AFCD) found that samples of the oral and nasal cavities of the dogs of people diagnosed with new crown pneumonia in Hong Kong had been weakly positive. AFCD said on 4 March that the results showed that the dog had become infected with the new coronavirus to a low degree, making it the first in the world.
As soon as the news came out, many people were surprised: Has the new coronavirus “mutated” and can spread in dogs? Then a new crown scare has spawned: many Australians choose to euthanize their pets, fearing they will get the disease and infect themselves and their families.
In response, the World Health Organization’s latest response is that there is no evidence that dogs are closely linked to the spread of the new coronavirus.
Li Gang, a researcher at the Beijing Institute of Livestock and Veterinary Medicine of the Chinese Academy of Agricultural Sciences, said that according to previous studies, there have been no reports of canine-like viral infections in humans or human coronavirus-infected dogs, but the new coronavirus’s animal infection spectrum is not yet known.
“In this regard, we first do not panic, its secondary attention and strengthen the research on the co-disease of the pet source of human animals, from the perspective of prevention and control of human and animal diseases to do a good job. “
Human-animal co-suffer syins to comply with Koch’s law
Infectious diseases are diseases caused by pathogenic microorganisms such as viruses, bacteria, or fungi. Amersome is a disease caused by the same pathogen, which is epidemiologically interrelated and is naturally transmitted between vertebrates and humans.
Li Gang pointed out that an infectious disease becomes a zoonotic disease condition son and animal disease condition severbelitosis must be able to spread between humans and animals, and cause corresponding clinical symptoms.
“Most animal-borne infectious diseases are transmitted to people through animals, such as rabies, cat-scratching, etc., and some animal-borne infectious diseases can be transmitted from humans to animals, such as tuberculosis. “
Li Gang said that the spread of infectious diseases between humans and beasts needs to meet the epidemic of infectious diseases necessary three basic conditions: the source of infection, transmission routes, susceptibility groups. When these three conditions exist at the same time and are connected to each other, the disease of the beast stakes and becomes popular.
Human and animal diseases are usually characterized by large hazards, strong infection, high mass, regional wideness and obvious occupationality.
Li Gang told the China Science Daily that testing human and animal diseases mainly uses laboratory methods such as pathogen isolation, molecular biology techniques (such as PCR, gene sequencing) and immunoserology techniques (e.g. ELISA, neutralization and experiments) to detect whether humans and animals contain pathogens, specific nucleic acids, antigens and antibodies.
“The diagnosis of human and animal disease should be based on clinical symptoms, epidemiological investigation, pathological changes and laboratory diagnosis of comprehensive judgment. Li Gang stressed.
Cui Shangjin, a researcher at the Beijing Institute of Livestock and Veterinary Medicine of the Chinese Academy of Agricultural Sciences and chief scientist of the Pet Disease Prevention and Control Innovation Team, believes that the first step in determining whether an animal is infected with a disease must first see if it has the corresponding symptoms and whether it is excreted.
The determination of whether it is contagious depends on whether the disease can cause illness in multiple animals or as many individuals in an animal.
Li Gang told reporters that for new infectious diseases (including viral human-animal disease) to determine the relationship between pathogens and susceptible animals to comply with the Koch law.
Koch’s law is a set of scientific verification methods proposed by German bacteriologist Robert Koch to verify the relationship between bacteria and disease, which is later hailed as the golden rule of infectious disease pathogen identification.
According to Koch’s law, first, the same microbes appear in each case and do not exist in healthy people; The microbe can be re-isolated and cultured from the host of the experimental disease.
Strengthen the detection of new coronavirus in animals
Animal disease prevention and control experts say dogs would have liked to use their nasal and oral cavities to express intimacy with their owners and like to sniff out ground objects. If the owner is infected with the new coronavirus and becomes ill, the virus can be transmitted to pets through close contact and contaminated items in the home, which is a toxic substance.
“The new coronavirus is suitable for survival and reproduction in the human respiratory tract, and it is possible to exist and survive in the upper respiratory tract of contaminated dogs for a period of time. Cui Shangjin said.
Li Gang believes that the above-mentioned pet dog detection of new coronavirus nucleic acid, the first need to eliminate the possibility of external pollution. If the virus can be detected in the pet for several consecutive days, and after a certain period of time the body also reacts (e.g. specific antibodies detected in the serum), the animal can be considered infected with the new coronavirus.
So why does this new coronavirus weakly positive pet dog have no symptoms? Cui Shangjin told China Science Daily that one possibility is that many animals have antibodies to suppress the virus, so it is not easy to develop symptoms.
“It’s likely to be the same as previous studies: new coronaviruses detected in bats, fruit beavers, pangolins, etc., although very similar to those in humans, do not cause veterinary disease, and dogs are just carriers of the virus.” He said.
Earlier, Shi Zhengli, a researcher at the Wuhan Virus Research Institute of the Chinese Academy of Sciences, did some research on the infection of the new coronavirus, and published an article in Nature that the new coronavirus may use angiotensin conversion enzyme II (ACE2) as a cell receptor to invade the host. The researchers demonstrated that the new coronavirus can be combined with ACE2 in humans, Chinese horseshoe bats, fruit beavers and pigs in addition to ACE2 in mice.
The World Health Organization also says that because dogs and cats are born without ACE2 receptors, the s-protein of the new coronavirus cannot invade cells in pets, so it cannot survive and reproduce in pets.
As a result, most researchers believe that the greatest significance of the dog test results is to warn that pets such as cats and dogs are at potential risk of spreading the virus.
Still, Cui Shangjin said the dog should be closely tracked for the new coronavirus later. “It is recommended to detect new coronaviruses in dogs, cats, dragonflies and other animals to reduce the possible transmission of new coronaviruses. “
With the continuous improvement of living standards, people keep dogs no longer for “home care homes”, cats are no longer for the purpose of catching mice, dogs and cats and other animals have gradually become a family member, become our important “partner”.
Studies have shown that when a country’s GDP per capita reaches $3,000 to $8,000, the pet industry will grow rapidly.
At present, China’s per capita GDP has passed the $8000 mark, with economic growth, urbanization process accelerated, more and more people will keep pets. According to the 2019 White Paper on China’s Pet Industry, the number of pet dogs and cats in cities and towns nationwide has reached 99.15 million in 2019.
Small animal industry has formed an industry, Cui Shangjin suggested that the state should legislation as soon as possible, strengthen management, government departments should increase the importance of human companion animals, do a good job in pet prevention work, “common diseases to strengthen immunization, the emergence of epidemic diseases to continue to monitor.”
And in the face of human-animal disease, the public is often prone to panic, do inappropriate things. In this regard, Li Gang said, should deal with the common disease of human and animal, in accordance with the traditional way to prevent the disposal of infectious diseases can be. “Simply put, it’s about controlling the source of infection, cutting off the route of transmission, and protecting susceptible groups. “
He believes that the public need not be overly nervous, as long as attention to the following points, will reduce the risk of disease: pet as a family member as well-
“At present, the vast number of pampered and pampered people to do, or in accordance with the requirements of government departments, continue to do a good job of their own, family and pets security protection work, waiting for more authoritative scientific information released, do not arbitrarily discard, kill pets. Cui Shangjin said.
Affected by the outbreak of new coronary pneumonia, since the Spring Festival, the majority of pet hospitals in Yangzhou City, Jiangsu Province, are closed, while Yangzhou University Animal Hospital has taken measures to stop service during the outbreak.
The doctors of the pet clinic in the animal hospital, by telephone, QQ and WeChat, maintain close online contact with the favorite, conduct one-on-one online consultation services, solve the diagnosis of common diseases in the pet home, and express the pet medicine that the pet is in urgent need.
Liu Zongping, dean of Yangzhou University’s School of Veterinary Medicine, who has long been engaged in research on animal nutrition metabolic and poisoning diseases, called on veterinarians to use their expertise to help people ease the panic of the epidemic, and to treat pets mainly and keep pets scientifically.
“Animals and humans share the same ecosystem, animal diseases are closely related to human health, and the World Health Organization has put forward the concept of ‘one health’, and we should treat animal health, human health and ecological environment as a whole,” he told China Science Daily. “