what's worse a or b flu
ABC. A is the worst, causes pandemics and epidemics B causes epidemics C is minimally problematic If you're talking about strains, you have 9 types of Hemagglutinin anâ¦d 16 types of Neuraminidase. So H5N1 (swine flue from a couple years ago) has Hemagluttinin number 5 and Neuraminidase number 1.