[Analysis of the situation of swine influenza in the districts Upper Bavaria, Swabia, Freiburg and Tübingen based on antibody profiles of piglets from Bavarian breeding farms].
A total of 1026 serum samples from 388 pigs from three Bavarian rearing farms in the region of Swabia were investigated in the course of investigations into the development of antibodies against Influenza A virus subtypes H1N1, H1N2 and H3N2 by haemagglutination inhibition test during the period from November 2002 to February 2004. There were no signs of respiratory disease during this period. The antibody titres decreased steadily in this period which corresponds to the kinetics of maternally-derived antibodies. Therefore the antibodies reflect the situation of influenza in the farms of origin from which the piglets were purchased. These farms were located in Bavaria and Baden-Wuerttemberg. There was a high activity of H1N1 influenza A viruses in this region whereas the antibody profiles against H1N2 and H3N2 varied between the different farms, which can be attributed to past vaccinations and infections. Thus there was a uniform immunological situation within the regions against H1N1 whereas that against H1N2 and H3N2 differed. The analysis of the antibody profiles allows conclusions to be drawn about the epidemiological situation and means of immunoprophylaxis.
Klinik für Schweine der Veterinärmedizinischen Universität, Wien, Osterreich.
Christiane
C
Lang
Andreas
A
Palzer
Ralf
R
Dürrwald
Hans-Joachim
HJ
Selbitz
Mathias
M
Ritzmann
D000818:Animals; D005858:Germany / Q000453:epidemiology; D006385:Hemagglutination Inhibition Tests / Q000662:veterinary; D053118:Influenza A Virus, H1N1 Subtype / Q000302:isolation & purification; D057221:Influenza A Virus, H1N2 Subtype / Q000302:isolation & purification; D053122:Influenza A Virus, H3N2 Subtype / Q000302:isolation & purification; D009976:Orthomyxoviridae Infections / Q000453:epidemiology / Q000662:veterinary*; D012703:Serotyping / Q000379:methods / Q000662:veterinary; D013552:Swine; D013553:Swine Diseases / Q000453:epidemiology / Q000821:virology*