has role immunizes recipient immunizes against pathogen Mesomycoplasma hyopneumoniae Sus scrofa licensed pig vaccine Mycoplasma hyopneumoniae vaccine USDA licensed vaccine role bacterial and viral combination vaccine Swine Influenza vaccine Swine Influenza Vaccine-Mycoplasma Hyopneumoniae Bacterin Oliver He vaccine USDA: 4995.22 Asiyah Yu Lin licensed influenza vaccine USA licensed veterinary vaccine