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Toxoplasma gondii in wild boars and domestic pigs in Sweden

implications for food safety

Wallander, Camilla (2016). Toxoplasma gondii in wild boars and domestic pigs in Sweden. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2016:12
ISBN 978-91-576-8526-1
eISBN 978-91-576-8527-8
[Doctoral thesis]

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Abstract

Ingestion of undercooked meat is a major risk factor for human toxoplasmosis, a disease caused by the zoonotic protozoan parasite Toxoplasma gondii. Infected pork, mutton and game meat are considered important infection sources in Europe. This thesis aims to describe the epidemiology of T. gondii in two possible key species for human toxoplasmosis in Sweden, namely domestic pigs and wild boars.

Approximately half of the wild boars investigated were found to be T. gondii seropositive, and the seroprevalence was dependent on age, geographical region, and year of sampling. In conventional fattening pigs the seroprevalence was estimated to 1%, compared to 8% in pigs raised in organic management systems with pasture access (KRAV). A one-month increase in pasture access was associated with an 80% increase in the odds of being seropositive. This strengthens the hypothesis that pigs become infected via their natural rooting behaviour. The high level of T. gondii infection in wild boars, and the increasing demand for outdoor management systems for pigs, emphasise the need of consumer awareness of proper cooking procedures to prevent infection.

Other means to limit meat-borne transmission could include abattoir-based serological screening of pigs to reduce the amount of T. gondii infected meat distributed to consumers. Since it has been suggested that such screening systems could be based on meat-juice serology, a study was conducted to investigate aspects of the sampling and preparation of meat-juice samples. It was found that antibody levels in meat juice varied depending on the muscle used for extraction, and in meat juice obtained from the diaphragm, levels of anti-T. gondii IgG correlated poorly with levels in serum. However, the level of anti-T. gondii IgG in meat juice was associated with the total level of IgG, which could possibly be used to assess if enough antibodies have been distributed to the meat-juice sample for the test result to be reliable. However, implementation of meat-juice serology in risk-management programmes needs to be preceded by further evaluation and standardisation of sampling, extraction, and testing
procedures.

Authors/Creators:Wallander, Camilla
Title:Toxoplasma gondii in wild boars and domestic pigs in Sweden
Subtitle:implications for food safety
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :2016
Depositing date:19 February 2016
Volume:2016:12
Number of Pages:86
Papers/manuscripts:
NumberReferences
IWallander C., Frössling J., Dórea F.C., Uggla A., Vågsholm I. & Lundén A. Pasture is a risk factor for Toxoplasma gondii seroprevalence in fattening pigs. (Submitted)
IIWallander C., Frössling J., Vågsholm I., Uggla A. & Lundén A. (2015). Toxoplasma gondii seroprevalence in wild boars (Sus scrofa) in Sweden and evaluation of ELISA test performance. Epidemiology and Infection 143(9), 1913-1921.
IIIWallander C., Frössling J., Vågsholm I., Burrells A. & Lundén A. (2015). "Meat juice" is not a homogeneous serological matrix. Foodborne Pathogens and Disease 12(4), 280-288.
Place of Publication:Uppsala
Publisher:Department of Biomedical Sciences and Veterinary Public Health, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8526-1
ISBN for electronic version:978-91-576-8527-8
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L70 Veterinary science and hygiene - General aspects
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Pathobiology
Agrovoc terms:swine, domestic animals, wild boar, sus scrofa, toxoplasma gondii, toxoplasmosis, human diseases, food safety, pork, disease transmission, disease surveillance, immunodiagnosis, elisa, organic agriculture
Keywords:Toxoplasma gondii, Organic, Meat juice, Fattening pig
URN:NBN:urn:nbn:se:slu:epsilon-e-3235
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-3235
ID Code:13081
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Biomedical Sciences and Veterinary Public Health
External funders:C. F. Lundströms stiftelse and Stadsveterinär Billströms stipendiefond
Deposited By: Camilla Wallander
Deposited On:22 Feb 2016 07:21
Metadata Last Modified:04 Mar 2016 16:23

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