[Vaccines against viral diseases of swine: the present needs]

animal viruses aujeszky virus cell mediated immunity cerdo humoral immunity immunità umorale infection infezione influenzavirus porcin inmunidad celular inmunidad humoral lelystad virus parvovirus porcin parvovirus porcino parvovirus suino pestivirus porcin porcine parvovirus suini swine swine influenzavirus vaccin vaccination vaccinazione vaccines vaccini vacuna virus d'aujeszky virus de aujeszky virus de la influenza porcina virus de lelystad virus de los animales virus degli animali virus des animaux virus di aujeszky virus di lelystad