Protein Sciences reports that the FDA has extended the shelf life for Flublok, its game changing seasonal influenza vaccine, to nine months from the date of manufacture, increasing the previous shelf life by three months.

The longer shelf life will make it easier for healthcare providers and pharmacies to stock Flublok and vaccinate people throughout the influenza season, which in some years can last as long as April or May.

In a clinical study of approximately 9,000 adults 50 years and older, Flublok proved to be 43% more effective than a traditional egg-based flu vaccine in protecting people against cell culture confirmed influenza.