How long do immunities to viruses last?
The flu shot is most effective for a period of one year. To succesfully combat the flu yo should get a flu shot every single year; as you can be infected with different strains of virus.
TAGS: infection, flu, viruses, symptoms, infected, host cell, immunity, infect, cells, body, proteins, RNA, virus, influenza, treatment, disease, DNA, genes, illness, vaccine
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