Twenty sows were examined as part of an investigation into the relative importance of the genital and urinary tracts as sites of leptospiral persistence in pigs. The sows had previously either aborted leptospire-infected fetuses or aborted on farms where leptospire infection had been demonstrated in other litters. Leptospires belonging to the Australis serogroup were recovered from the upper genital tract of all the sows. In contrast, leptospires were only recovered from 75 per cent of their kidneys. Isolates from 10 of the sows were identified to serovar level: six were serovar muenchen and four were bratislava. Persistence was observed in renal and genital tissues for up to 147 days after abortion.
Summary
Thirteen strains of pathogenic leptospires were isolated from 12 of 91 horses; seven strains belonged to the Australis serogroup (serotype bratislava) with three, two and one strains belonging to the Icterohaemorrhagiae, Hebdomadis (serotype hardjo) and Autumnalis serogroups respectively.
Using leptospires isolated from horses and others representing the known parasitic Leptospira serogroups, a sample of 650 mares' sera was tested for agglutinating antibodies. Antibodies were found in 89.1 per cent of sera. The predominant reaction was to serotype bratislava, strain S/1334/79, isolated in this study, antibodies to which were detected in 81.8 per cent of sera.
It is suggested that serotype bratislava may be adapted to, and maintained by, the horse population in Northern Ireland.
Résumé
On a isolé 13 souches de leptospiroses pathogènes sur 12 individus d'une population de 91 chevaux; sept souches appartenaient au sérogroupe Australis (serotype bratislava); trois souches appartenaient au sérogroupe Icterohaemorrhagiae, deux au sérogroupe Hebdomadis (sérotype hardjo) et un au sérogroupe Autumnalis.
En utilisant des leptospires isolés sur des chevaux et d'autres représentant les sérogroupes connus de leptospires parasites, on a testé 650 juments et recherché des anticorps agglutinants. Des anticorps furent trouvés dans 89.1 pour cent des sérums. La réaction dominante fut celle avec le sérotype bratislava souche s/1334/79 isolée au cours de cette étude (81.8 pour cent des juments).
On avance l'idée que le serotype bratislava peut s'être adaptéà la population équine d'Irlande du Nord et peut s'y maintenir.
Zusammenfassung
Dreizehn pathogene Leptospirenstämme wurden aus zwölf von 91 untersuchten Pferden isoliert. Sieben Stämme gehörten zur Australis‐Serogruppe (Serotyp Bratislava) — drei, zwei und ein Stamm zu Icterohaemorrhagiae, Hebdomadis (Serotyp Hardjo), beziehungsweise Autumnalis.
Die Pferdeisolate und andere Repräsentanten der pathogenen Leptospiren‐Serogruppen wurden zur Untersuchung von 650 Stutenseren verwendet. Agglutinierende Antikörper konnten in 89.1 prozent der Seren festgestellt werden. Die häufigste Reaktion erfolgt gegen den Serotyp Bratislava S/1334/79, isoliert im Laufe dieser Arbeit) mit 81.8 prozent positiver Seren.
Es wird vermutet, dass der Serotyp Bratislava sich in Nord‐Irland ans Pferd adaptiert hat und dass er über das Pferd erhalten bleibt.
In a bacteriological investigation of 60 cows and heifers from an abattoir Leptospira interrogans serovar hardjo was isolated from 39 (65 per cent) animals. The genital tract (57 per cent) appeared to be as important a site of hardjo localisation as the urinary tract (62 per cent). This is believed to be the first report of genital hardjo infection in naturally infected cattle.
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