To maintain vaccine efficacy, WHO regularly updates influenza vaccine strains based on global epidemiological, virological, ...

Periodically, the yearly flu transforms into a particularly virulent strain, like the Spanish flu that killed millions of people in 1918. How do these pandemic strains arise? Aa Aa Aa Although ...

Influenza B, Influenza C and Influenza D. Only two of these types — Influenza A and Influenza B — are the culprits of the yearly winter epidemics known as “flu season.” But what exactly is ...