{"id":17675,"date":"2026-03-03T00:10:36","date_gmt":"2026-03-02T23:10:36","guid":{"rendered":"https:\/\/valintermed.com\/?p=17675"},"modified":"2026-03-03T00:10:36","modified_gmt":"2026-03-02T23:10:36","slug":"pochemu-gripp-vozvraschaetsya-kazhdyy-god-mehanizm-mutatsii-virusa","status":"publish","type":"post","link":"https:\/\/valintermed.com\/en\/medlibrary\/why-does-the-flu-return-every-year-the-mechanism-of-virus-mutation\/","title":{"rendered":"Why the flu returns every year: the mechanism of virus mutation"},"content":{"rendered":"
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Influenza is not just a \"cold with a fever.\" It is an acute viral respiratory disease that claims tens of thousands of lives worldwide each year and threatens the operation of schools, hospitals, and even entire sectors of the economy. Its characteristic feature is the ability to return every season, like clockwork, even in the presence of a vaccine. Why does this happen? The answer lies not in the laziness of the immune system or in \"bad weather,\" but in the astonishing, almost cunning biology of the virus itself: its genetic structure constantly changes, \"deceiving\" the body's defense mechanisms. And if you think that last year's vaccination should protect you \u2014 you are mistaken. The virus has already changed. And it is this mutation mechanism that makes influenza one of the most difficult infectious agents to control on the planet.<\/p>\n

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