ArticleActa veterinaria Scandinavica2007
Clinical mastitis in ewes; bacteriology, epidemiology and clinical features.
Article in Acta veterinaria Scandinavica, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 28 papers.
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28 citing papers in PubMed, 106 citations in OpenAlex.
- Ecological Dynamics ofAntibiotics (Basel, Switzerland) · 2026Article
- Genetic diversity and within-farm transmission of Staphylococcus aureus from ewes in Norway.BMC microbiology · 2026Article
- Article
- Milking systems and colostrum handling as an agent for the spread of poliarthritic Streptococcus dysgalactiae strains in sheep farms: case report.BMC veterinary research · 2025Article
- Farmer perceptions of clinical mastitis incidence, risk factors and epidemiology in meat-producing sheep flocks in the UK and the Republic of Ireland.The Veterinary record · 2025Article
- High throughput transcriptomics analysis of ovine mammary epithelial cells stimulated with Staphylococcus aureus in vitro.PloS one · 2025Article
- Etiology and antimicrobial resistance of subclinical mastitis pathogens Staphylococcus aureus, Streptococcus spp. and Enterococcus spp. in sheep milk.Veterinary research communications · 2024Article
- An Investigation of Virulence Genes ofAnimals : an open access journal from MDPI · 2024Article
- Cross-Sectional Study Assessing Management Practices and Udder Health in California Sheep Flocks and Seroprevalence of Small Ruminant Lentivirus.Animals : an open access journal from MDPI · 2024Article
- Virulence Mechanisms of Staphylococcal Animal Pathogens.International journal of molecular sciences · 2023Review
- Assessment of Changes in Udder Half Defects over Time in Non-Dairy Ewes.Animals : an open access journal from MDPI · 2023Article
- Modern Imaging Techniques in the Study and Disease Diagnosis of the Mammary Glands of Animals.Veterinary sciences · 2023Review
- Vaccination against Bacterial Mastitis in Sheep.Vaccines · 2022Article
- Effects of management strategies during early lactation and weaning on etiological agents of ovine subclinical mastitis and antimicrobial susceptibility of milk-derived bacterial isolates.Journal of animal science · 2022Article
- Effect of Palpable Udder Defects on Milk Yield, Somatic Cell Count, and Milk Composition in Non-Dairy Ewes.Animals : an open access journal from MDPI · 2021Article
- Relationships among intramammary health, udder and teat characteristics, and productivity of extensively managed ewes.Journal of animal science · 2021Article
- Will Fly Repellency Using Deltamethrin Reduce Intramammary Infections, Stress and Fatigue Indicators of Dairy Ewes under Intensive Management?Pathogens (Basel, Switzerland) · 2021Article
- Polymorphism of Selected Regions ofAnimals : an open access journal from MDPI · 2020Article
- Subclinical mastitis in sheep: etiology and association with milk somatic cell count and ewe productivity in three research flocks in the Western United States.Translational animal science · 2019Article
- Digital gene expression analyses of mammary glands from meat ewes naturally infected with clinical mastitis.Royal Society open science · 2019Article
Corrections and comments
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Authors and funding
5 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundClinical mastitis is an important disease in sheep. The objective of this work was to identify causal bacteria and study certain epidemiological and clinical features of clinical mastitis in ewes kept for meat and wool production.
methodsThe study included 509 ewes with clinical mastitis from 353 flocks located in 14 of the 19 counties in Norway. Clinical examination and collection of udder secretions were carried out by veterinarians. Pulsed-field gel electrophoresis (PFGE) was performed on 92 Staphylococcus aureus isolates from 64 ewes. RESULTS AND
conclusionS. aureus was recovered from 65.3% of 547 clinically affected mammary glands, coagulase-negative staphylococci from 2.9%, enterobacteria, mainly Escherichia coli, from 7.3%, Streptococcus spp. from 4.6%, Mannheimia haemolytica from 1.8% and various other bacteria from 4.9%, while no bacteria were cultured from 13.2% of the samples. Forty percent of the ewes with unilateral clinical S. aureus mastitis also had a subclinical S. aureus infection in the other mammary gland. Twenty-four of 28 (86%) pairs of S. aureus isolates obtained from clinically and subclinically affected mammary glands of the same ewe were indistinguishable by PFGE. The number of identical pairs was significantly greater than expected, based on the distribution of different S. aureus types within the flocks. One-third of the cases occurred during the first week after lambing, while a second peak was observed in the third week of lactation. Gangrene was present in 8.8% of the clinically affected glands; S. aureus was recovered from 72.9%, Clostridium perfringens from 6.3% and E. coli from 6.3% of the secretions from such glands. This study shows that S. aureus predominates as a cause of clinical ovine mastitis in Norway, also in very severe cases. Results also indicate that S. aureus is frequently spread between udder halves of infected ewes.
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