As flu season rages across the United States, federal regulators say they have approved a new kind of vaccine for the virus.
The new product, Flublok, which is available in limited supplies for the current season, is different from other flu vaccines, because it isn't made using eggs or an influenza virus, the Food and Drug Administration said Wednesday.
Instead, Flublok's production involves programming insect cells grown in steel tanks to produce large amounts of a particular flu virus protein, known as hemagglutinin, according to Protein Sciences, the vaccine's manufacturer.
Most human antibodies that fight flu infection are directed against hemagglutinin, the FDA said.
Flu vaccine attitudes abroad differ from U.S. This method allows for more rapid production, making more of the vaccine available more quickly in the event of a pandemic, the FDA said.