According to reports, the U.S. Food and Drug Administration (FDA) recently approved the vaccine, known as Flublok, which contains recombinant DNA technology and an insect virus known as baculovirus that is purported to help facilitate the more rapid production of vaccines.

According to Flublok's package insert, the vaccine is trivalent, which means it contains GM proteins from three different flu strains. The vaccine's manufacturer, Protein Sciences Corporation (PSC), explains that Flublok is produced by extracting cells from the fall armyworm, a type of caterpillar, and genetically altering them to produce large amounts of hemagglutinin, a flu virus protein that enables the flu virus itself to enter the body quickly.