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Monitoring Antibodies to Mycoplasma hyopneumoniae in Sow Colostrum – a Tool to Document Freedom of Infection

Analys av antikroppar gentemot Mycoplasma hyopneumoniae - er metod att dokumentera infektionsfrihet

Abstract

In a survey in Finland in 1995, 14919 colostral whey samples from 530 farrowing herds were analysed by a monoclonal blocking-ELISA to detect antibodies to Mycoplasma hyopneumoniae (M. hyopneumoniae). Antibodies were detected in 274 (1.8%) samples and in 42 herds (7.9%). The median prevalence of sows with antibodies in seropositive herds was 28.2% (range, 2.7–100%). According to clinical and pathological follow-up in finishing herds in 1996, all of the farrowing herds which were seronegative in 1995, were truly non-infected with M. hyopneumoniae. In acutely infected herds, samples collected earlier than 2 h after farrowing were 3 times more likely to contain antibodies than samples collected 2–12 h after farrowing (odds ratio, 3.0; 95% CI, 1.4–6.6). Repeated freezing or spoilage of the colostrum samples did not cause biologically relevant problems for the ELISA. Antibodies to M. hyopneumoniae were shown to persist up to 3 years in some sows. As a conclusion, colostrum samples were very sensitive samples for the screening of herds for M. hyopneumoniae infection and possibly also for a regular surveillance.

Sammanfattning

I en kartläggning i Finland år 1995 analyserades 14 919 råmjölksprov från 530 besättningar för antikroppar mot Mycoplasma hyopneumoniae (M. hyopneumoniae). En monoklonal blocking-ELISA användes. I småbesättningarna analyserades prov från varje sugga. I de stora besättningarna analyserades 30 prov. Alla besättningarna var med i något hålsoövervakningsprogram. Antikroppar mot M. hyopneumoniae konstaterades i 274 prov (1.8%) och i 42 besättningar (7.9%). Medianprevalensen av suggor med antikroppar i seropositiva besättningar var 28.2% (variation, 2.7%–100%). Enligt uppföljning i år 1996 var alla besättningarna, som var seronegativa i 1995, faktiskt infektionsfria avseende M. hyopneumoniae. I akut infekterade besättningarna var prov som hade mjölkats tidigare än 2 timmar efter grisningen, 3 gånger oftare seropositiva än prov som hade mjölkats 2–12 timmar efter grisningen (odds ratio, 3.0; 95% konfidens intervall 1.4–6.6). Upprepad frysning eller förskämning av råmjölksprov påverkade inte betydligt resultaten av ELISA testen. Efter en lyckad sanering påvisades antikroppar mot M. hyopneumoniae upp till 3 år efter saneringen bland suggor som var fodda fore saneringen. Sammanfattningsvis; råmjölksprov kan effektivt användas för kartläggning av suggbesättningar avseende M. hyopneumoniae infektion. Råmjölksprovtagning förefaller användbar också for regelbunden kontroll för nyinfektioner.

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Rautiainen, E., Tuovinen, V. & Levonen, K. Monitoring Antibodies to Mycoplasma hyopneumoniae in Sow Colostrum – a Tool to Document Freedom of Infection. Acta Vet Scand 41, 213–225 (2000). https://doi.org/10.1186/BF03549630

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