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Biomedical subjects

I J Visser

Publications and source records attributed to I J Visser.

At least 19 recordsLinked to original sources
PubMed2000

[Lambing ewes as a source of severe psittacosis in a pregnant woman].

The first documented Dutch case of an ovine Chlamydia psittaci infection concerned a 20-year-old woman in the 26th week of pregnancy, following contact with lambing sheep. She had a severe sepsis and had to be artificially ventilated. Finally, the patient made a full recovery. The preterm born child died directly after birth. The placenta showed an acute intervillitis in which chlamydial antigen was demonstrated immunohistologically. Infection with an ovine C. psittaci was confirmed by sequence analysis of amplified chlamydial DNA from the placenta. Infections with C. psittaci are typically associated with contact with (sick) birds. However, mammals also may act as a source of human infection, especially sheep in which C. psittaci is an important cause of abortion. Infections with ovine C. psittaci are a particular hazard for pregnant women, in whom there is severe placentitis and frequently foetal loss. Such infections are mainly associated with contact with lambing sheep.

Adult↗
PubMed1999

Failure of antibiotics gentamycin, tylosin, lincomycin and spectinomycin to eliminate Mycoplasma bovis in artificially infected frozen bovine semen.

To study the effect of antibiotics upon Mycoplasma bovis in fresh bovine semen just before freezing, specimens of bovine semen were artificially infected with 1 of 9 different strains of M. bovis. Inocula of each strain were prepared to contain 10(5) to 10(6)/mL colony-forming units of M. bovis at 3 different stages of the growth phase. The infected semen was diluted with a Tris extender by a 3-step procedure using an antibiotic mixture of gentamicin, tylosin, lincomycin and spectinomycin (GTLS). This semen-antibiotic mixture was placed into French straws that were stored at -196 degrees C. The control semen specimens contained no antibiotics Mycoplasmas were counted after 8 d of storage in 3 decimal dilutions of the frozen semen. No evident effect was noticed upon the 9 tested strains of mycoplasmas in the semen frozen with the antibiotics, compared with that of the untreated control samples. It was further shown that this lack of effect was irrespective of the stage of the growth phase of the mycoplasmas. It was concluded that the antibiotic mixture (GTLS) in semen specimens is not capable of total elimination of mycoplasmas in frozen bovine semen.

Animals↗
PubMed1999

Factors influencing the isolation of Mycobacterium avium subsp. paratuberculosis from bovine fecal samples.

A modified procedure was used for culture of Mycobacterium paratuberculosis (Mptb) from bovine feces. Bovine fecal samples were decontaminated with NaOH, exposed to a mixture of oxalic acid and malachite green, incubated in a mixture of neomycin and amphotericin B. Decontaminated specimens were inoculated onto modified Löwenstein-Jensen medium. Specimens processed by high-speed centrifugation showed growth earlier than specimens prepared by low-speed centrifugation. However, the overall number of positive cultures at 16 weeks was not different for the 2 methods. When infected dairy herds were sampled 4 times at 6-month intervals and culture-positive cows were culled, the prevalence of infected cattle declined over time. After selective culling, the cattle left in the herds shed low numbers of Mptb, which explains why it took longer for cultures to become positive. No heifers younger than 11 months were culture positive, but heifers 13-14 months of age were more frequently culture positive than were heifers of any other age. The 16-week culture period is needed with this method to detect cattle shedding low numbers of Mptb. High-speed centrifugation of samples does not increase the efficiency of identification of animals shedding Mptb.

Age Factors↗
PubMed1998

[Pustular dermatitis in veterinarians following delivery in farm animals; an occupational disease].

OBJECTIVE: To assess the prevalence of contact dermatitis after deliveries in cattle or sheep among veterinarians. DESIGN: Retrospective. SETTING: Provinces of Groningen, Friesland, and Drenthe, The Netherlands. METHODS: By means of a short inquiry 310 veterinarians were asked whether and how often they had experienced pustular dermatitis after deliveries in cattle and sheep and what course the dermatitis had run. They were also asked about details of the deliveries (type of animal, condition of the foetus, course of the partus), about microbiological investigation, preventive measurements and therapy. RESULTS: The response to the questionnaires was 24.5%. One or more episodes of pustular dermatitis on an arm after a delivery in cattle or sheep was noticed by 62 (81.5%) of the 76 respondents. Sometimes it was associated with secondary symptoms like headache, fever and lymphadenitis. Listeria monocytogenes (7 times out of 13) and Salmonella dublin (4/13) were the agents cultured most often. CONCLUSION: Contact dermatitis after deliveries in cattle or sheep occurs frequently as an occupational disease of veterinarians.

Animals↗
PubMed1998

[Not Available].

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Agriculture↗
PubMed1997

[Severe watery diarrhea caused by Vibrio cholerae in lambs].

An outbreak of watery diarrhoea in lambs is described. Seventeen lambs died within 24 hours after the start of the diarrhoea. At necropsy Vibrio cholerae was isolated from the organs and intestines of three lambs. The strains did not react with O1 or O139 antisera, the strains responsible for cholera epidemics among humans. It is concluded that the diarrhoea in the lambs was caused by V. cholerae non-01/non-139. This microorganism had not been described before in lambs in the Netherlands.

Animals↗
PubMed1997

Bovine fetal neosporosis: a comparison of epizootic and sporadic abortion cases and different age classes with regard to lesion severity and immunohistochemical identification of organisms in brain, heart, and liver.

Eighty bovine fetuses with confirmed neosporosis were used to score lesion severity and presence of parasites in brain, heart, and liver. A comparison was made between epizootic and sporadic abortion cases. The possible influence of fetal age was also investigated. Histologic lesions of multifocal encephalitis, myocarditis, and periportal hepatitis with or without focal hepatocellular necrosis were almost always observed. Neospora caninum tachyzoites were identified immunohistochemically in 85% of the brains, 14% of the hearts, and 26% of the livers. Tissue cysts were observed in 21% of the brains. Significant differences between epizootic and sporadic abortion cases were found only in the liver. Hepatic lesions were more prominent and N. caninum tachyzoites were observed more frequently and in higher numbers in epizootic cases. Examination by immunohistochemistry of the liver in addition to the brain can be highly contributive diagnostically, particularly in epizootic cases. There were no significant age-related differences except for a higher presence of tachyzoites in the hearts of younger fetuses (3-4 months gestational age).

Abortion, Veterinary↗
PubMed1996

[Pustular dermatitis in veterinarians following delivery in domestic animals; an occupational disease].

OBJECTIVE: To assess the prevalence of contact dermatitis after deliveries in cattle or sheep among veterinarians. DESIGN: Retrospective. SETTING: Provinces of Groningen, Friesland and Drenthe, The Netherlands. METHODS: By means of a short inquiry 31O veterinarians were asked whether and how often they had experienced pustular dermatitis after deliveries in cattle and sheep and what course the dermatitis had run. They were also asked about details of the deliveries (type of animal, condition of the foetus, course of the partus), about microbiological investigation, preventive measurements and therapy. RESULTS: The response to the questionnaires was 24.5%. One or more episodes of pustular dermatitis on an arm after a delivery in cattle or sheep was noticed by 6(2) (81.5%) of the 7(6) respondents. Sometimes it was associated with secondary symptoms like headache, fever and lymphadenitis. Listeria monocytogenes (7 times out of 13) and Salmonella dublin (4/13) were the agents cultured most often. CONCLUSION: Contact dermatitis after deliveries in cattle or sheep occurs frequently as an occupational disease of veterinarians.

Animals↗
PubMed1995

[Salmonella dublin infections on a goat farm].

A Salmonella Dublin infection in young goats has been described. In a period of two weeks, 16 of 70 female-kids died within one day, because of septicaemia. Bad hygiene and management measures were discussed as the main reason for this outbreak.

Animal Husbandry↗
PubMed1992

[Salmonella dublin infections in cattle, a review].

In this review Salmonella dublin infections in cattle are discussed. Pathogenic pathways and clinical symptoms in calves and cows are mentioned in addition to diagnostic methods like post mortem examination, bacteriological methods and serology. Epidemiological aspects like carrier state in cows and the survival of the bacteria in the environment are discussed. Without reliable tests to detect carriers, we suggest that control of this infection on farms must be based on prevention, improved hygiene and therapeutic measures. Vaccination can be used to improve the immunity of the herd.

Animals↗
PubMed1992

[Salmonella dublin on dairy farms in the North of the Netherlands].

During the last century many calves and cows with Salmonella dublin infections are diagnosed in the North of the Netherlands, especially in the province of Friesland. In this paper are retrospectively traced the problems by paratyphoid infections in cattle, from 1919 till now, the diagnosis of which was made at the Animal Health Service in Friesland and North-Netherlands. Over the decennia a decrease is noticed for the percentage of necropsies of calves with S. dublin infections, although some irregular peaks appear. However since 1988 an increase is observed in dairy farms with S. dublin problems, revealing high mortality in calves, abortions and sick cows.

Animals↗