Cop: Why the swine flu virus is causing concern

, July 2 (Xinhua) -- The ability of a swine flu virus to infect humans has increased, with the potential for an influenza pandemic in humans, according to a recent study. This has caused a lot of concern, so what exactly is swine flu, and why is it related to the human pandemic?
influenza virus can be roughly divided into A, B, C three types, influenza A virus according to its surface structure and its genetic characteristics can be divided into many subtypes, some of which can cause respiratory diseases in pigs, so called swine flu virus. The swine flu virus can be transmitted throughout the year in pigs with a higher incidence and a lower mortality rate.
according to the website
The Harbin Veterinary Research Institute, swines are an important host of influenza viruses. There are two main influenza H1N1 viruses in pigs, the classic H1N1 swine flu virus and the H1N1 swine flu virus in poultry. Both swine flu viruses can infect people.
In particular, the classic H1N1 swine flu virus, which, according to research, entered the swine population in 1918 and, through long-term evolutionary recombination, entered the population in North America in 2009, triggering a "human swine flu" outbreak in Mexico and the United States and spreading rapidly around the world. The World Health Organization initially referred to the flu as "human swine flu" and later renamed it "H1N1 influenza". In June of that year, WHO declared a global influenza A (H1N1) pandemic.
H1N1 influenza virus was transmitted from birds to pigs in Europe in 1979 and subsequently became endemic in pigs in many countries in Europe and Asia, with reports of human infection.
end of 2015, the Harbin Veterinary Research Institute issued a press release saying that the team led by the researchers found that the Eurasian avian H1N1 swine flu virus has gained the ability to infect people, has the potential to cause an influenza pandemic in humans, and should be given high priority.
, researchers studied the nose swabs of nearly 30,000 pigs between 2011 and 2018 and found that the G4 EA H1N1 influenza virus (G4 genotype Eurasian bird H1N1 influenza virus) in pigs was highly contagious and had the ability to infect people, potentially causing a global pandemic, according to a paper published in the National
Journal.
the study raised concerns about another pandemic. In response, Michael Ryan, Executive Director of the WHO Emergency Project, stressed on 1 July that the G4 EA H1N1 influenza virus mentioned in the study in pigs was not a new virus and had been monitored by national and WHO influenza surveillance networks for many years.
Ryan said WHO and the Chinese Centers for Disease Control and Prevention have worked together to develop a variety of candidate vaccine strains for the development of related vaccines, and have been keeping an eye on the progress of each vaccine strain to ensure that large-scale vaccine production is available once an effective vaccine strain is found. He mentioned it as part of a framework to help prevent influenza pandemics.