[Serological studies on swine. Significance and interpretation of laboratory results for clinical practice]

Establishing a diagnosis in swine herds on the basis of previous histories, clinical symptoms and/or pathological lesions is becoming increasingly difficult for veterinarians. The services of a laboratory for performing serological examinations are therefore increasingly enlisted. Some aspects are described in the present paper, which are essential to an optimum serodiagnosis of Haemophilus pleuropneumoniae infections, Aujesky's disease, influenza and parvovirus infections.