Polyculture of chickens, ducks, geese and pigs may lead to the occurrence and spread of bird flu. Because poultry's flu virus can be transmitted to pigs, human influenza virus can also be transmitted to pigs. Since the influenza virus has 8 different nucleic acid fragments, when the two different virus particles co-infect a cell, the nucleic acid fragments will be recombined and arranged to produce new influenza virus particles. This new type of influenza virus particles is often used by people. Can form a big epidemic, causing great harm. In addition, chickens should not be polycultured with ducks, geese and other water birds. Because the flu viruses of various subtypes in waterfowl have a high rate of carrying, and some do not show any clinical symptoms, the chicken virus in the feces can cause the occurrence and prevalence of bird flu, resulting in serious economic losses.
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