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Biomedical subjects

S Herr

Publications and source records attributed to S Herr.

43 records · Page 3Linked to original sources
PubMed1980

The isolation of Brucella abortus biotype I from serologically positive reactors following on S19 adult inoculation of dairy cows.

The incidence of infection following adult inoculation is such that this method alone cannot be relied on to control the spread of brucellosis. Brucella infection is present in a high percentage of serologically positive cases using the interpretation of titres as applied in South African. One premature and one full term calf born to cows 7-9 months after adult vaccination as well as the placentae, discharges and colostrum were all heavily infected with B. abortus biotype I.

Agglutination Tests↗
PubMed1980

Lesions resulting from inoculation of porcine foetuses with porcine parvovirus.

In utero inoculation of 15 sows at various stages of gestation with a local strain of porcine parvovirus (PPV) resulted in resorption, abortion or the birth of weak, dead, or mummified foetuses. Histopathological lesions observed in foetuses of sows slaughtered at various post-inoculation intervals consisted of a perivascular inflammatory reaction primarily observed in the brain and kidneys. The presence and extent of the inflammatory reaction were dependent upon the age of the foetus at the time of infection. In the sow a perivascular inflammatory reaction was found in the endometrium, while the larger blood-vessel walls were infiltrated by lymphocytes, and it is suggested that these vascular lesions may contribute to the reproductive failures associated with PPV.

Animals↗
PubMed1979

Wesselsbron disease: a cause of congenital porencephaly and cerebellar hypoplasia in calves.

Fifteen pregnant cows were inoculated subcutaneously and intravenously between 101-147 days of gestation with the wild-type Wesselsbron disease virus. In addition, 2 foetuses were injected directly through the uterine wall after surgical exposure of the pregnant horn. The clinical symptoms, viraemia and serology in the cows are reported, as also the gross- and histopathology and the virological and serological results of the calves and foetuses. Abortion was not an important manifestation of experimental Wesselsbron disease in cows, as it occurred in 3 animals only. Apart from a short temperature reaction in some cows no other clinical symptoms were recorded. A viraemia was not always present in these cows and, when detected, was of low magnitude and short duration. One cow, in which the foetus was ioculated at 115 days of gestation, aborted at 231 days. The foetus showed marked porencephaly and cerebellar hypoplasia.

Animals↗