The disease-causing properties of the virus strains are modified to not cause influenza1
The virus strains replicate efficiently in the nasopharynx at 25°C, a temperature that is restrictive for replication of many wild-type influenza viruses1
The virus strains do not replicate at 37°C to 39°C, temperatures at which many wild-type influenza viruses grow efficiently1
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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