What is avian flu and can it infect people

It's contagious, and people die very quickly when they get it, and the news reports have already had people die of bird flu.

Various subtypes of avian influenza viruses can be pathogenic, but the virulocity varies from subtype to subtype. According to the pathogenicity of avian influenza virus to poultry animals, it can be divided into three categories: high pathogenicity, low pathogenicity and non-pathogenicity. Highly pathogenic avian influenza spreads quickly, has high morbidity and mortality, and the infected flocks often all die, which is extremely harmful; Low pathogenic avian influenza can cause mild respiratory symptoms, reduced food intake, reduced egg production, and sporadic mortality in birds; Non-pathogenic avian influenza does not cause noticeable symptoms, but only produces antibodies to the virus in infected birds.

It is generally believed that highly virulent highly pathogenic avian influenza viruses are susceptible to infect humans, and these avian influenza viruses are mostly subtypes H5 and H7.

The intensity of pathogenicity can be different in humans and animals.

The H5N1 avian influenza virus is highly pathogenic and often causes outbreaks in local avian fauna before infecting humans, resulting in the death of many avian animals. So, what is the human infection with the H7N9 avian influenza virus?

First of all, it should be clear that the virulence of avian influenza viruses is not static. Sometimes some low-pathogenic avian influenza viruses can mutate into highly pathogenic strains and cause an epidemic of highly pathogenic avian influenza. Since the discovery of the H7N9 avian influenza virus in 2008, it has been considered a low-pathogenic avian influenza virus.

But in March of this year, Dr. Berser, a doctor in Atlanta, USA, and his collaborators published their research results in the journal Virology, saying that in recent years, the increased virulence of the H7N9 avian influenza virus and the increased pathogenicity of rats and ferrets may be a signal that it is ready to march into humans.

Second, the pathogenicity of a virus to poultry does not mean that it is also pathogenic to other species or humans. Even among avian animals, the pathogenicity of a virus varies from one virus to another. For example, scientists have found that the H5N1 avian influenza virus, which is highly pathogenic to chickens, may not cause disease or only mild symptoms in ducks. Recently, the National Avian Influenza Reference Laboratory detected the H7N9 avian influenza virus in pigeon samples from the Huhuai Agricultural and Sideline Products Wholesale Market in Songjiang District, Shanghai, and the results of genetic sequence analysis showed that the strain was a low-pathogenic avian influenza virus, which was highly homologous to the human isolate of H7N9 avian influenza virus.

This suggests that the H7N9 avian influenza virus is likely to be the least pathogenic avian influenza of the poultry epidemic, but it is very virulent to humans and can cause severe respiratory infections and even death in humans.

<> you can make a combination of this table yourself.

If there are birds drawn on both sides, and at least one side of the pig is not drawn (there is no requirement for the person to draw it), it is called bird flu.

Categories: Healthcare.

Problem description: Can you be specific

Analysis: How likely is it that avian influenza will spread from person to person?

There have been no documented reports of human transmission of avian influenza, and no cases of infection among health care workers in close contact with avian influenza patients have been reported. Based on this, experts speculate that it is unlikely that avian influenza will be transmitted between people and Muzhi people at present.

However, the possibility of human-to-human transmission of avian influenza cannot be completely ruled out, because after the avian influenza virus enters the human body, it is possible to genetically recombine with the original influenza virus in the human body to produce a new influenza virus, resulting in a more difficult to control epidemic.

Can avian influenza spread from person to person?

Laboratory tests are currently being carried out to conclusively determine whether the virus can be transmitted from humans to humans, eventually causing a global plague. Experts from the World Health Organization and Viet Nam stressed that there is no evidence that the virus can be transmitted from humans to humans. However, the World Health Organization warns that if the virus mutates, the consequences will be very serious.

First, avian influenza is an acute infectious disease caused by avian influenza virus, which can also infect humans, and the symptoms after infection are mainly manifested as high fever, cough, runny nose, myalgia, etc., most of which are accompanied by severe pneumonia, and severe heart, kidney and other organ failure lead to death, and serious will also cause death, the incidence rate is still quite high, so it is necessary to hurry up when these symptoms appear, so as not to cause more serious consequences.

Second, avian influenza is a virulent infectious disease caused by the avian influenza virus (AIV), which is prevalent mainly in flocks. Mostly diseases that come out of chickens.

Third, avian influenza is the abbreviation of avian epidemic, which is an acute infectious disease caused by a subtype of influenza A virus (also known as avian influenza virus), which can also infect humans, and is designated as a class A infectious disease by the International Bureau of Animal Epidemiology, also known as true chicken plague or European chicken plague.