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The role of Mannheimia species in ovine mastitis

Lida Omaleki1, Glenn F Browning, Joanne L Allen

  • 1Veterinary Preclinical Centre, Department of Veterinary Science, The University of Melbourne, Corner Flemington Road and Park Drive, Parkville, Victoria 3010, Australia. l.omaleki@pgrad.unimelb.edu.au

Veterinary Microbiology
|April 23, 2011
PubMed

Insights

Mannheimia haemolytica causes severe sheep mastitis, often leading to toxaemia and udder necrosis. Limited data exist on its epidemiology, and current treatments are frequently unsuccessful due to rapid onset.

Area of Science:

  • Veterinary Medicine
  • Microbiology
  • Animal Health

Background:

  • Mannheimia haemolytica is a significant cause of intramammary infection in sheep.
  • This bacterium typically induces severe clinical mastitis, toxaemia, and gangrenous necrosis of the udder.
  • Limited epidemiological and pathogenetic data exist for Mannheimia-associated mastitis in sheep.

Purpose of the Study:

  • To review the significance of Mannheimia species in sheep mastitis.
  • To highlight the limited understanding of the epidemiology and pathogenesis of this condition.
  • To discuss the potential for horizontal transmission and treatment challenges.

Main Methods:

  • Literature review of existing studies on Mannheimia haemolytica and sheep mastitis.
  • Analysis of epidemiological data, focusing on transmission routes.
  • Examination of pathogenetic mechanisms and clinical presentation.
  • Review of current treatment outcomes and prevention strategies.

Main Results:

  • Mannheimia haemolytica can be a more significant mastitis pathogen than Staphylococcus aureus in certain sheep flocks.
  • Horizontal transmission between ewes, potentially via lamb sucking, is suggested by some data.
  • The peracute nature and sudden onset of mastitis make treatments often unsuccessful.
  • No effective vaccine is currently available for prevention.

Conclusions:

  • Mannheimia species represent a critical concern in sheep mastitis, necessitating further research into their epidemiology and pathogenesis.
  • Effective prevention and treatment strategies are lacking, highlighting a significant gap in animal health management.
  • Understanding transmission dynamics is crucial for controlling outbreaks in sheep flocks.

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