These products can include a pdm09-like element that underwent quadruple reassortment. A universal form of this product has been designed using the stem of a hemagglutinin protein, which is one of two types of surface proteins found on the target of this product. (-5[1])In the USA, this product is moving to a trivalent composition as the Yamagata lineages are no longer circulating. This yearly product is traditionally (10[1])produced by growing strains in chicken eggs. (10[2])In North America, (10[1])this product is administered in (10[1])the (10[1])fall, before the onset of a virus’ (10[2])namesake “season”. For 10 points, (10[1])name this yearly product, used against a respiratory virus with subtypes like H1N1. (10[1])■END■