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. 1982;23(3):392-9.
doi: 10.1186/BF03546790.

Listeria monocytogenes excretion and humoral immunity in goats in a herd with outbreaks of listeriosis and in a healthy herd

Listeria monocytogenes excretion and humoral immunity in goats in a herd with outbreaks of listeriosis and in a healthy herd

T Løken et al. Acta Vet Scand. 1982.

Abstract

In a herd of 65 goats with outbreaks of listeriosis (Herd A) blood, faeces and milk were collected just after the outbreaks, about 1 month later and at delivery about 4 months thereafter. Faeces and milk were examined bacteriologically and blood and milk serologically for Listeria monocytogenes (Lm), and the results were compared with those of 2 similar samplings in a healthy herd (Herd B).

In Herd A Lm was isolated from faeces in 5 of 14 septicaemic does and in 6 of 48 other animals on the first sampling, and in 4 and 1 animals respectively, on the subsequent 2 samplings. In milk Lm was demonstrated just after the outbreaks only, viz. in 3 of 12 septicaemic does and in 16 of the other 32 examined. Four does excreted Lm in both faeces and milk on this date. In Herd B Lm was demonstrated only at delivery, i.e. from 10 of 43 animals. Most of the isolates belonged to serotype 1.

Reciprocal geometrical mean titres (GMT) of antibodies in sera from the septicaemic group decreased from 236 to 140 and 136 respectively on the subsequent samplings, whereas GMT of the encephalitic animals and of the remainder of Herd A increased from about 20 to about 100 at delivery. GMT of Herd B increased toward delivery from 23 to 39, with largest increase for the does. GMT in whey were ≤ 18 for all groups.

I ein flokk på 65 geiter med utbrot av listeriose (flokk A), vart det teke pr0ver av blod, feces og mj0lk i tilslutnad til utbrota, omlag 1 månad seinare og ved kjeing 4 månader deretter. Feces og mjølk vart undersøkt bakteriologisk og blod og mjølk serologisk for Listeria monocytogenes (Lm). Resultata vart samanlikna med 2 tilsvarande prøveuttak i ein frisk flokk (flokk B).

Ved første prøveuttak i flokk A vart Lm isolert frå feces hjå 5 av 14 geiter med septikemi og hjå 6 av 48 av dei andre dyra. I dei 2

påfølgjande prøveuttaka vart bakterien isolert hjå h0 ves vis 4 og l geit. I mjølk vart Lm påvist berre i prøver uttekne nær utbrota, då hjå 3 av 12 geiter med septikemi og hjå 16 av 32 andre, 4 geiter skilde ut bakterien både i mjølk og feces. I flokk B vart Lm påvist berre ved kjeing. 10 av 43 dyr skilde ut bakteriar, og 4 både i mjølk og feces. I dei fleste tilfella tilhøyrde bakteriane serotype 1.

Det resiproke geometriske middeltiteret (GMT) av antistoff i sera frå dyr med septikemi avtok frå høvesvis 236 til 140 og 136 ved dei påføygjande prøveuttaka. I same tidsrom auka GMT hjå dyra med encephalitt og hjå dei andre dyra i flokk A frå omlag 20 til omlag 100. GMT for flokk B auka frå 23 til 39, med størst auke hjå vaksne geiter. GMT i mjølk var ≤ 18 hjå alie gruppene.

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References

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