Immunity after infections with Myxoviruses.

Influenza, parainfluenza and respiratory syncytial viruses cause respiratory infections in man with consequent transient and sometimes imperfect against reinfection. Humoral immunity and probably cell-mediated immunity contribute to resistance. Whereas circulating antibodies are more important for influenza viruses, secretory antibody are relatively speaking more important for parainfluenza and respiratory syncytial virsues. Measles and mumps induced longlasting immunity which can be correlated with circulating neutralizing antibodies. Certain immune responses against measles and respiratory syncytial virus cause pathological reactions after infection with the same virus.