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J S Hellstrom

Publications and source records attributed to J S Hellstrom.

8 recordsLinked to original sources
PubMed1984

A serological study of bovine leptospirosis in the district of Taranaki.

A cross-sectional serological survey of dairy cattle in Taranaki in 1979-80 indicated that 62% (551/891) of the animals had evidence of Leptospira interrogans serovar hardjo infection as disclosed by the microscopic agglutination test. Titres to Leptospira interrogans serovar pomona were demonstrated in only 4% (23/591) of the animals examined. The high prevalence of hardjo infection is suggestive of an endemic infection whilst the low level to pomona is indicative of sporadic infection. In a detailed examination of 10 herds, 9 revealed high (55%-91%) prevalence of serological reactions to hardjo and the herd profiles of titres, indicated that the animals had become infected at one to two years of age. A field strain of hardjo from cattle as well as the usual laboratory strain (hardjoprajitno) was incorporated in the test but there were no significant differences between the results given by the two antigens.

Journal Article↗
PubMed1979

Deer and health.

Explore the source record for details and available documents.

Animals↗
PubMed1978

Survival of Leptospira interrogans serovar pomona in an acidic soil under simulated New Zealand field conditions.

Leptospira interrogans serovar pomona was found to survive for at least 42 days in a typical New Zealand soil under simulated winter field conditions. The soil was markedly acidic with a pH of 5.5 and survival times were not reduced even when its water content was only 23%. The values of both these parameters are considerably less than previously recorded for the survival of leptospires in soil. Two methods were used to recover leptospires from the soil microflora. One was the culture of a membrane filtrate in EMJH media with or without contaminant-suppressing additives and the other was the direct inoculation of soil-washings into hamsters. Both techniques proved to equally sensitive. It was estimated that following the addition of 5 X 10(8) leptospires to the soil samples less than 2 X 10(4) were present after six weeks.

Animals↗