Vorkommen von Antikörpern gegen Toxoplasmen, Leptospiren und das Porcine Reproduktive und Respiratorische Syndrom Virus sowie von Salmonellen und Ascaris suum in biologischen Mastschweinebetrieben in Österreich.
Occurence of antibodies against Toxoplasma, Leptospira and PRRSV and the incidence of Salmonella and Ascaris suum in organic pig fattening farms in Austria
Dissertation, Vet. Med. Univ. Wien, pp. 24.
An important aspect of organic pig farming is the increase of animal welfare under special housing conditions, among others, access to outdoor runs. Outdoor runs bear the risk of infection with pathogens from the environment and those transmitted from (wild) animals. Aim of the study was to assess the prevalence of zoonotic agents like Toxoplasma (T.) gondii, Leptospira and Salmonella - and economically important pathogens as the Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) and Ascaris (A.) suum in organic fattening farms. At four different slaughterhouses in Austria 1053 blood samples and fecal samples from pigs originating from 59 organic farms were sampled from July until September 2014. All serum samples were tested for the presence of antibodies against T. gondii, eight pathogenic Leptospira serovars, PRRSV, Classical Swine Fever virus (CSFV) and Pseudorabies virus (PRV). The fecal samples were bacteriologically examined for Salmonella and tested for A. suum eggs via flotation. In 29 farms antibodies against T. gondii were detected. Leptospira antibodies were found in at least one pig in all investigated farms. In 22 farms, more than 10 % of the blood samples were positive for PRRSV antibodies. All samples were negative for antibodies against CSFV and PRV. Only one pooled fecal sample was tested positive for Salmonella, which was identified as S. Infantis. 69.5 % of the fecal samples were positive for A. suum with one third of the samples being positive at a low level, another third at a moderate level and the last third at a high level. Fattening pigs raised in organic farms often have contact to zoonotic agents. The information about the infection and health status of the pigs is the basis for risk assessment and for decision making with regard to the implementation of biosecurity measures. The aim is, to decrease the risk of infection with specific microorganisms in organic pig production systems.