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R Niskanen

Publications and source records attributed to R Niskanen.

25 records · Page 2Linked to original sources
PubMed1993

Winter dysentery diagnosed by farmers in dairy herds in central Sweden: incidence, clinical signs and protective immunity.

The occurrence of winter dysentery, diagnosed by farmers and defined as an outbreak of diarrhoea among at least 30 per cent of adult cattle in a herd, was monitored in 256 dairy herds in an area of central Sweden. The cumulative incidence of winter dysentery between April 1988 and March 1989 was 28.5 per cent. A typical outbreak lasted for one to two weeks and 74 per cent of the outbreaks occurred between November and January. A decrease in milk yield was reported in 90 per cent of the affected herds and the cows showed respiratory signs in 57 per cent of them. There was a significant (P < 0.05) association between the occurrence of fever and coughing. In 31 per cent of the outbreaks the farmer also noticed diarrhoea among the calves. One-third of the affected herds had experienced an outbreak within the previous four years and 18 per cent had at least one further outbreak during the following two years. There was a significantly (P < 0.05) lower disease score in herds that had had an outbreak within the previous four years than in herds which had had a less recent or no previous outbreak, indicating the development of temporary immunity to the causative agent.

Animals↗
PubMed1991

Determination of level of antibodies to bovine virus diarrhoea virus (BVDV) in bulk tank milk as a tool in the diagnosis and prophylaxis of BVDV infections in dairy herds.

An indirect ELISA has been evaluated for determination of the level of antibodies to BVDV in individual milk samples and recently in bulk tank milk from dairy herds. As part of an epidemiological study, bulk milk and individual milk samples from all cows in 15 dairy herds were analysed for antibodies to BVDV two times one year apart. There was an excellent correlation between the level of antibodies in the bulk tank milk and the prevalence of BVDV antibody positive cows. The mean prevalence of BVDV antibody positive cows in the 15 dairy herds was 45.5% (188/413) at the first sampling and 46.2% (191/413) one year later. Seven of the herds had no, or only a low number of antibody positive cows. In contrast, between 52 to 100% of the cows in seven other herds were antibody positive to BVDV. In the 15th herd all cows without antibodies at the first sampling were antibody positive to BVDV one year later, indicating a recently introduced BVDV infection in this herd. Analysis of bulk milk samples for BVDV antibodies is now routinely used in Sweden as a tool in diagnosis and prophylaxis of BVDV infections in dairy herds. The importance and advantages of this diagnostic technique, that has made it possible to establish BVDV-free dairy herds, is discussed.

Animals↗
PubMed1991

Bovine coronavirus as the causative agent of winter dysentery: serological evidence.

Sera from 9 dairy herds with epizootic enteritis (winter dysentery) were examined for antibodies to bovine coronavirus (BCV) and bovine virus diarrhoea virus (BVDV). Cows in 8 of the 9 herds seroconverted to BCV alone, while the animals in the ninth herd, which showed severe symptoms of the disease, seroconverted both to BCV and BVDV. The BCV antibodies, which were present in high titres 1 year postinfection, were transferred to the offspring via the colostrum and were then detectable in sera of calves until these were approximately 5 months old. A serological survey of 549 Swedish heifers showed that 61% of the animals were reactors to BCV. The prevalence of seroreactors to BCV was equally distributed over Sweden but was commonly either high or low in herds. In conclusion, BCV is commonly detected in animals suffering from winter dysentery. A co-infection with BVDV appears to aggravate the disease.

Animals↗
PubMed1990

Renorrhaphy with a polyglycolic acid mesh.

In recent years resorbable polyglycolic acid mesh has been successfully used in the treatment of splenic injuries. The use of a resorbable mesh seems promising also in the treatment of renal injuries and in the rare ruptures of renal allografts. The authors report their own experience in the use of resorbable polyglycolic acid mesh in the treatment of a renal injury.

Child↗
PubMed1989

Evaluation of an enzyme-linked immunosorbent assay for detection of antibodies to bovine virus diarrhoea virus in milk.

The present study shows that milk is an appropriate source for detection of seroreactors to bovine virus diarrhoea virus (BVDV). There was close agreement between antibody titres in serum and in skim milk, as determined by an indirect enzyme-linked immunosorbent assay. The antibody titres were usually lower in skim milk than in serum, but all seropositive cows (n = 84) were also skim milk-positive and all but one seronegative cow (n = 55) proved negative in skim milk. During lactation, the level of antibodies to BVDV in milk showed an inverse relationship to the amount of milk produced. However, there was a sufficient level of antibodies in milk throughout lactation to permit an adequate determination of BVDV antibody status in dairy cows. There was a mutual good agreement between milk antibody titre in the four mammary quarters, irrespective of milk cell count. Milk can be used to detect seroreactors to BVDV. Milk is preferable to blood in large-scale epidemiological studies, since the sampling procedure is much simpler.

Animals↗
PubMed1989

Delayed diagnosis of rupture of the main bronchus.

A case of a bronchus rupture with delayed diagnosis is reported. The symptoms of tracheobronchial lesions are discussed. With this case report the authors wish to bring attention to a rare but increasingly common injury in patients with multiple trauma.

Adolescent↗