Unlike other flu vaccines , Flublok does n't rely on bacteria or the flu virus . Instead , it 's made by growing a virus protein in insect cells . This allows for more rapid production in the event of a pandemic , the FDA says . Flublok contains the elements necessary to help fend off three different flu strains , including H1N1 and H3N2 , the regulator said . The vaccine is available in limited supplies during the current flu season .
Unlike other flu vaccines , Flublok does n't rely on bacteria or the flu virus . Instead , it 's made by growing a virus protein in insect cells . This allows for more rapid production in the event of a pandemic , the FDA says . The vaccine is available in limited supplies during the current flu season .