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1

False positive serological reactions to brucellosis in pigs: a growing problem in international trade

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Szulowski K., Iwaniak W., Weiner M., Zlotnicka J., Szymajda M., Zareba Z., Czepinska H.
Medycyna Weterynaryjna
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2013
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tom 69
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nr 04
The diagnosis of brucellosis in pigs is based almost entirely on serological assays. None of the tests has been shown to be reliable in routine diagnosis in individual pigs. The biggest problem are false positive serological reactions (FPSRs) caused primarily by Yersinia enterocolitica O:9. The OPS component of the sLPS of Brucella is almost identical with that of Y. enterocolitica O:9. Thus no routinely used serological tests based on this antigen can distinguish between antibodies raised to these two infections. This paper presents the results of the examinations of 6 batches of pigs (total of 452 serum samples) traded between countries and causing major diagnostic problems. Positive reactions in RBT, SAT, CFT and I-ELISA were observed in all these batches of animals. Additionally 2 out of 21 samples from one of the batches were positive in 2-Me. FPSRs in the diagnosis of pigs for brucellosis seem to be a growing problem in international trade. The absence of provisions explicitly regulating the problem of FPSRs may have serious consequences, such as the slaughter of animals or even international repercussions. Clear guidelines for dealing with such cases should therefore be formulated.
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Diagnostyka i sytuacja epidemiologiczna brucelozy bydła w Polsce

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Szulowski K., Iwaniak W., Weiner M., Zlotnicka J., Szymajda M., Zareba Z., Czepinska H.
Medycyna Weterynaryjna
|
2012
|
tom 68
|
nr 02
The surveys of cattle for brucellosis in Poland are primarily based on serological tests. The examinations are performed by regional laboratories using RBT. In the case of positive results obtained in this test the samples are examined in SAT and CFT. The definitive confirmatory investigations are conducted by the National Reference Laboratory for Brucellosis in the Department of Microbiology of NVRI in Pu³awy, which additionally uses Coombs’ test, 2-Me test and ELISA. In the paper the results of the examination of cattle in Poland in the years 2005-2010 are shown. Each year during this period 1.1-1.3 million animals were included in the surveys and 130-317 cows were involved in confirmatory investigations. 12-34 animals were classified as positive for brucellosis. In bacteriological examinations of samples from seropositive cows, Brucella abortus was never once isolated. Since 2009 Poland is officially a brucellosis free country.
3
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Diagnostyka i sytuacja epidemiologiczna brucelozy świń w Polsce

100%
Szulowski K., Iwaniak W., Weiner M., Zlotnicka J., Szymajda M., Zareba Z., Czepinska H.
Życie Weterynaryjne
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2011
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tom 86
|
nr 05
4

International trade - a potential source of brucellosis in pigs

100%
Szulowski K., Iwaniak W., Zlotnicka J., Weiner M., Zareba Z., Czepinska H.
Medycyna Weterynaryjna
|
2011
|
tom 67
|
nr 01
Brucellosis was confirmed in boars imported for breeding purposes to Poland from one of the EU countries. In serological investigations, in which the RBT, ELISA, CFT, SAT and 2-ME were used, positive reactions to brucellosis were found in 9 out of 23 animals. All the animals were slaughtered, and bacteriological examination was performed. Brucellae were isolated from the tissues of 7 boars. The characteristics of the strains isolated showed that they belonged to Brucella suis biovar 2, which is typical for Europe. The examination of animals for brucellosis at quarantine stations seems to be crucial for the protection of herds from Brucella infection.
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