Consequence to serological examinations in blood according to the diagnosis of Rhinitis atrophicans.

In a period of three years in 95 breeding-herds, which were free from Rhinitis atrophicans (R. a.), 5001 bloodsamples were examined. All samples were examined by the SNT/EBL-cellculturetest - mostly however by the SNT/ELISA-system - and were free of antibodies against R. a. On the contrary in 6 herds, that had bought swines from latent infected populations, antibodies against the toxin could be found before clinical signs were to be seen and before toxin producing pasteurellas could be discovered, too. In other 4 herds antibodies against R. a. could be found. In the last mentioned herds R. a. was suspected by clinical, bacteriological and pathomorphological examinations. The serological determination of blood may replace the provement of the diameter of the nose by pathomorphological diagnosis. The serological investigation is a good test. After positive results of antibodies comprehensive bacteriological tests should follow. This can be integrated in the diagnostical system of R. a. very easily, because enough blood samples will be taken ordered by the official examinations for European Swinefever - and Aujeszky-disease.