Quadrivalent Influenza Vaccine (Flu)

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Since the first isolation of influenza viruses in 1993, influenza vaccines have continued to be developed, until as recently as 2012, the World Health Organization (WHO) recommended adding the B-strain to another vaccine to more effectively prevent influenza: the Quadrivalent Influenza Vaccine, which covers the following four strains of the virus:

1. Influenza virus strain A/H1N1

2. Influenza virus A/ H3N2

3. Victoria family B influenza virus

4. Influenza virus strain B, family Yamagata

The World Health Organization recommends vaccination against four strains of influenza as it is more effective in preventing influenza.