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In January 1982 an outbreak of diarrhoea among adult dairy cows in a closed herd of approximately 200 milking animals was shown to be caused by the introduction of bovine virus diarrhoea virus (BVDV). Affected animals showed a significant reduction in milk yield. One animal died and four were culled. Eight cows aborted and one weak calf was born. Of 121 calves born that year, 26 died, mostly from pneumonia, but five aged from three weeks to five months had enteric lesions of mucosal disease. Subsequent investigations of the whole herd in 1983 and 1984 showed that virus spread among the adults was slow and that BVDV continued to make a major contribution to calf losses. Again the greatest cause of loss was suppurative or fibrinous pneumonia. Overall, BVDV was isolated from 36 animals. Isolation of virus from a wide range of tissues of individual animals confirmed that they were viraemic at death. Viruses from calves dying of pneumonia and from aborted fetuses were non-cytopathic in tissue culture. Isolates showing varying degrees of cytopathogenicity were obtained only from tissues of one calf with a congenital neurological defect and the seven animals with enteric lesions consistent with a diagnosis of mucosal disease. Blood from all 89 BVDV antibody-free animals older than three months was tested for the presence of BVDV. Altogether, 12 calves were identified as persistently viraemic and all were apparently healthy when bled. Only two matured normally, four grew poorly and six died.(ABSTRACT TRUNCATED AT 250 WORDS)
Vet Rec 1985 Nov 02
PMID:Disease in a dairy herd associated with the introduction and spread of bovine virus diarrhoea virus. 300 58

Investigation of a sight defect in a pedigree bull, born as a result of artificial insemination and ovum transplantation, led to the finding that the animal was persistently infected with bovine virus diarrhoea virus. Virus was cultured from blood and from nasal and ocular swabs and was present in semen in high titre. At necropsy, virus was cultured from a wide range of tissues. The pathological findings are described and discussed as are the potential hazards of such infections.
Vet Rec 1986 Mar 22
PMID:Persistent bovine virus diarrhoea virus infection in a bull. 301 May 38

Vibrio cholerae biotype el tor strain BM2508, resistant to trimethoprim, 0/129, streptomycin and spectinomycin was isolated from the faeces of a child with severe diarrhoea. Resistance to trimethoprim and 0/129 was due to a dihydrofolate reductase type I and resistance to streptomycin-spectinomycin to a 3'',9-aminoglycoside-aminocyclitol adenylyltransferase. The resistance genes were not transferable to Escherichia coli and, as inferred from ultracentrifugation in cesium chloride-ethidium bromide and agarose gel electrophoresis of crude bacterial lysates, were located on the chromosome. The resistance genes were transposed to multiple sites of plasmids belonging to incompatibility groups 6-C and P, introduced in BM2508 and were subsequently transferred to E. coli (rec-), Salmonella typhimurium, V. cholerae and V. parahaemolyticus strains where they re-transposed into the chromosome. Analysis of plasmid DNA from the transconjugants by agarose gel electrophoresis following digestion with HindIII and by Southern hybridization using a ColEl::Tn7 probe indicated the presence of a 14-kilobase transposon, Tn1527, closely related to Tn7. The emergence of Tn1527 in V. cholerae may lead to prophylactic and therapeutic failures due to trimethoprim resistance and to bacterial misidentification because of cross resistance to 0/129.
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PMID:Transposable resistance to trimethoprim and 0/129 in Vibrio cholerae. 301 28

A vaccine of rotavirus and K99 antigen from enterotoxigenic Escherichia coli was emulsified in oil adjuvant and administered intramuscularly to pregnant cows. Calves born to and reared on vaccinated dams were protected against experimental rotavirus infection at five days old when compared with calves from unvaccinated control cows. Field trials of the vaccine were carried out in 40 commercial herds, in which half the cows in each herd were selected at random for vaccination and half were left unvaccinated. In 31 herds (2641 cows) there was no significant diarrhoea problem (less than 10 per cent morbidity); these herds were excluded from further analysis. The nine remaining herds did experience a calf diarrhoea problem of greater than 10 per cent morbidity, but on four farms the disease was associated with cryptosporidiosis and on a fifth no enteropathogens were detected; these five farms (461 cows) were also excluded from further analysis. Of the remaining four herds, two beef suckler herds (105 cows) had concurrent rotavirus and cryptosporidial infections, and vaccination was associated with a decreased excretion of rotavirus but not with a decreased incidence of diarrhoea. In the other two dairy herds (68 cows) with prevaccination rotavirus problems, there was a significantly decreased incidence of diarrhoea in calves born to vaccinated cows. No natural field challenge of enterotoxigenic E coli was encountered on any of the trial farms.
Vet Rec 1986 Jul 12
PMID:Evaluation of a combined rotavirus and enterotoxigenic Escherichia coli vaccine in cattle. 301 89

Vaccination of cows with a combined, inactivated, adjuvanted rotavirus and Escherichia coli vaccine resulted in increased neutralising antibody titres to rotavirus in serum and colostral whey. Evidence was obtained that vaccination resulted in a decreased incidence of rotavirus shedding and of abnormal faeces or diarrhoea in young calves fed colostrum and milk from the vaccinated dams. The E coli component of the vaccine was not evaluated because no natural challenge was evident.
Vet Rec 1987 Mar 14
PMID:Effect of vaccination of the dam on rotavirus infection in young calves. 303 70

An account is given of an outbreak of malignant catarrhal fever which occurred in a 98-cow dairy herd. Ten animals died or were slaughtered and the disease was confirmed by clinical and histological examination. Serological tests for malignant catarrhal fever virus were positive in three of four animals. The diagnosis of malignant catarrhal fever was complicated by the presence of bovine virus diarrhoea virus infection in three of the early cases. The initial cases of malignant catarrhal fever occurred in a group of nine-month-old calves which were housed in an old milking parlour with 19 pedigree Suffolk ewes at lambing time. Later cases occurred in two adult cows and in two heifers. Investigations of the remainder of the herd for evidence of bovine virus diarrhoea virus did not reveal the presence of any persistently infected cattle. Serological examinations for antibody to malignant catarrhal fever and bovine virus diarrhoea virus were carried out on the 19 Suffolk ewes. Six of them had neutralising antibody titres to malignant catarrhal fever virus and three were positive in the indirect immunofluorescence test. The possible roles of bovine virus
Vet Rec 1987 Jun 06
PMID:Concurrent malignant catarrhal fever and bovine virus diarrhoea virus infection in a dairy herd. 303 13

A prospective cohort study was designed to describe the patterns and to determine the factors associated with the risk of rectal prolapse in a commercial swine herd in California, USA. Thirty (1.0 per cent) of 2862 pigs prolapsed between 12 and 28 weeks of age with the peak incidence occurring in 14- to 16-week-old pigs. The overall prolapse rate was 9.1 cases per 100,000 days at risk. Prolapse rates were highest during the winter and autumn months. Other factors associated with an increased risk of prolapse were maleness (relative risk 2.3) birthweight less than 1000 g (relative risk 3.4) Yorkshire boar A (relative risk 2.8) and dams of litter number 1 (relative risk 14.9), 2 (relative risk 8.2) and 3 (relative risk 9.8). No evidence was found to support the hypothesis that diarrhoea and coughing are factors associated with a risk of prolapse.
Vet Rec 1988 Aug 27
PMID:Patterns and determinants of rectal prolapse in a herd of pigs. 317 83

The occurrence and possible cause of intrahepatic cholestasis in two shorthorn cows from a herd with a history of weight loss, low milk yield and chronic intermittent diarrhoea are discussed.
Vet Rec 1988 Mar 12
PMID:Biliary calculi in a herd of shorthorn cattle in Lancashire. 336 55

The severity of diarrhoea and the degree of hyperaemia of the conjunctiva and nose were recorded in veal calves being fattened on either cows milk or milk-replacer. A skin-prick test using the milk-replacer as antigen was also performed. Control calves received only their mother's milk. Among these control calves there were no abnormalities, and in the calves fed other cows milk only slight abnormalities were seen. In contrast, in the calves fattened on milk-replacer, and especially in the calves showing the 'cachexia' syndrome, there were moderate to severe abnormalities and clear correlations were found between the severity of the diarrhoea and the hyperaemia of the conjunctiva and nose, and the scores recorded in the skin-prick test.
Vet Rec 1988 Jun 25
PMID:Conjunctivitis, red nose and skin hypersensitivity as signs of food allergy in veal calves. 340 27

'Wet vent', the principal clinical sign of which is diarrhoea, is common in budgerigars. In a survey of 83 cases examined post mortem 21 causes were found. The most common causes were enteritis, mainly of a non-infectious nature (18 cases), 'going light' (15 cases), abnormal gizzard structure (nine cases) and nephrosis (six cases).
Vet Rec 1987 Nov 07
PMID:A survey of the causes of 'wet vent' in budgerigars. 342 16


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