A twist and turn! There is no evidence to support salmon infection with the new coronavirus

outbreak of new crown pneumonia in Beijing's Xinfa market, linking salmon and new coronavirus to two things that can't be hit by eight poles.
people initially thought that salmon had no lungs and therefore could not be infected with the new coronavirus.
popular science article also suggested that as a low-class non-mammal, salmon does not have the ability to transmit the virus to humans.
But a 2019 paper published in the journal Elife in biology shows that Canadian researchers have previously found a Pacific salmon virus (salmon) virus (PsNV) in salmon, which attacks salmon gills and is a "eye" for coronaviruses, and that salmon infection with the new coronavirus appears to have a "real hammer"
On the evening of June 16th, at a press conference on the prevention and control of the outbreak of new crown pneumonia in Beijing, relevant people said that salmon had not detected the new coronavirus before entering the contaminated site.
salmon be infected with the new coronavirus? The answer to this question can be described as a twist and turn! What is the truth? On the 16th, a reporter from Science and Technology Daily interviewed industry experts.the classification of natural species by humans, following the law of "borderline genus", the more they stand together, the closer the kinship is.
new coronavirus, belongs to the net-nest virus coronavirus department of β coronavirus genus.
salmon virus, discovered by Canadian scholars, belongs to the same species as the new coronavirus.
" the virus is not in the same department as the new coronavirus, but the same goal, indicating that the difference is still very large. Tong Weigang, dean of the School of Life Sciences and Technology at Beijing University of Chemical Engineering, said the extension lines of the two viruses had been re-intersected after many levels, indicating a very distant relationship.
the gap between salmon viruses and new coronaviruses can be better understood if we look at them from the timeline of biological evolution. "Assuming that there is an evolutionary relationship between them, it will take tens of thousands of years or more to evolve." Tong said.
use that common saying: it is simply the "poison" of two worlds.
"so it's very likely that they won't share the same infected subjects, and the infected subjects of humans and aquatic organisms should be different." "Tong explained that studies have shown very low ogenosity between the ACE2 protein in fish and the ACE2 protein in human beings, and that there are very few amino acids of the same, so the likelihood that they will be infected through the same inhibitor is very small.
So, both in terms of kinship between the two and in terms of the route of infection of the virus, even if salmon is proven to be infected with a virus like the new coronavirus, the "evidence support" for the assertion that salmon can be infected with the new coronavirus is very limited.have found viruses in fish that are very similar to the Pacific salmon virus, " he said. Tong said that although fish and fish belong to one species and one to a reptile, they can be infected with the nest virus, indicating that the virus is widely distributed in nature.
" in fact, any kind of virus can infect any kind of species, such as we all know that mosquitoes carry the virus can infect people, and in theory, the difference between humans and mosquitoes, it seems that should not be infected. Tong said that mosquitoes carry a lot of viruses, but some can infect people, some can not. In addition, a virus does not necessarily infect the same organs between different species, so it is not possible to infect the lungs in humans with the same strategy as a virus.
is because any virus has the potential to infect any species, there will be cross-species transmission of the virus. Completely irrelevant animals, it is possible to be infected. Some viruses that have not been infected before may also infect humans in the future, which is also in line with the laws of virus evolution.
" in the virus tracing work, will consider the previously infected virus is most likely to re-infection, we suspect that there have been 'pre-9' species infected people, but not necessarily very far from the virus can not be infected. Tong said.
tong Tonggang stressed that infection or not can not be theoretically speculated, which needs to be verified by experiments, in the absence of experimental verification to speculate is not reliable. reported that the relevant departments from cutting imported salmon on the case board detected the new crown virus, then is not the time on the "knife" above the salmon infected with the new crown virus?
, salmon are more likely to carry the new coronavirus than to be infected with it. Tong said that salmon is far from the middle host of the new coronavirus, can only be passively carried. Moreover, cold-chained salmon are dead fish, and dead cells cannot support the virus's replication and infestion activities.
the relationship between the virus and salmon, it is more likely that people infected with the new coronavirus contaminated the fish, the fish carried the new coronavirus, and then after transport transfer, into the market, and then cause human infection. Tong believes that this suggests that in the prevention and control of epidemics, we may need to further guard against some foods, including fish, shrimp, crabs and so on. The new coronavirus, as an RNA virus, decreases the rate of inertestion in the environment in the case of cold chain transport, so there should also be some concern about some foods that need cold chain transport.
" If the experiment proves that the number of new coronaviruses in salmon live or salmon cells is increasing, it can confirm that the new coronavirus has the ability to infect salmon. Tong said that if the number of viruses cannot be increased, it indicates that there is no ability to infect.
" related departments may be carrying out relevant validation, if the ability to detect infection, in the prevention and control needs to take into account the risk of fish transmission of the virus. But tong said, this possibility is very small.
(Science and Technology Daily Beijing, June 16th)