The vaccine virus strains express the surface proteins of hemagglutinin (HA) and neuraminidase (NA) from the wild-type viruses identified by the WHO that are expected to circulate during the season1-3
With at least 5 attenuating points in each strain of FLUMIST vaccine, the odds of reversion to wild-type influenza are approximately 1 in 100 quintillion replication cycles (1x1020 replication cycles), more than a millennium in time5
FLUMIST QUADRIVALENT is a live attenuated vaccine.1 Other routinely administered live attenuated vaccines include those for MMR, varicella, and rotavirus.9
FLUMIST QUADRIVALENT is a vaccine indicated for active immunization of persons 2-49 years of age for the prevention of influenza disease caused by influenza A subtype viruses and type B viruses contained in the vaccine. FLUMIST QUADRIVALENT is for intranasal administration only.
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