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Flu, caused by the influenza virus, is a contagious infectious disease that can usually continue from autumn to spring.
Release Date: 28 08 2020
Flu, caused by the influenza virus, is a contagious infectious disease that can usually continue from autumn to spring. There are many subtypes of the virus and it is constantly changing.For this reason, the content of the vaccine is changed every year by the World Health Organization and it is recommended to be made again every year.
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