Bird flu animal vaccines may cause new mutations in the virus

Vaccination of poultry is considered an effective method to prevent bird flu, but the latest research shows that the vaccine may also lead to new mutations in the bird flu virus. This method is like a “time bomb” and may increase bird flu. The danger of spreading the virus among humans. The latest issue of the British "New Scientist" magazine reported that under normal circumstances, the method of injecting vaccines can indeed prevent birds from being infected with bird flu. The problem is that vaccines, especially flu vaccines, are not 100% effective. In the prevention of most animals from being infected, there will still be a small number of viruses that multiply in animals and continue to spread between animals. This "hiding in the dark" virus is very difficult to monitor, it can quickly spread in unvaccinated animals, or once the vaccine is over, these virus residues will trigger a new round of outbreaks, and the virus is likely to New mutations occur. One recent evidence is that David Suarez, an expert in poultry research laboratories of the U.S. Department of Agriculture, found that in 1995, Mexico used the vaccination method to stop the spread of the H5N2 bird flu virus. But since then, the bird flu virus that has been isolated from chicken flocks in Mexico has mutated and is now very different from the vaccine strain. Suarez and others believe that following the occurrence of bird flu in many countries and regions in Asia, preventive measures such as vaccination are also adopted for uninfected poultry. Then, the bird flu virus may also undergo "potential changes" like the Mexican bird flu virus. Experts believe that there are two ways to prevent the spread of these virus residues. One is to place some unvaccinated poultry next to the injected poultry as a “sentinel” to monitor the virus and can be found once the virus has spread. In addition, biomarker-based vaccines can also be used to monitor mutated viruses. Eliaria Kapoa, an expert from the World Animal Health Organization's bird flu reference laboratory, said that simply vaccinating rather than closely monitoring the vaccine may sometimes have the opposite effect. Not only can it not control the epidemic, but it can also lead to the further spread of the disease. .

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