A case report of Mycoplasma wenyonii associated immune-mediated haemolytic anaemia in a dairy cow

Nicola Gladden, Hayley Haining, Livia Henderson, Francesco Marchesi, Libby Graham, Michael McDonald, Fraser. R. Murdoch, Anna Bruguera Sala, Jayne Orr, Kathryn Ellis

A three year old, second lactation Holstein dairy cow presented to the Scottish Centre for Production Animal Health and Food Safety, Glasgow University Veterinary School in November 2014 with a history of post-calving vulval/vaginal bleeding nine days prior to presentation, followed by a sudden reduction in milk yield. Subsequent investigations resulted in a diagnosis of immune-mediated haemolytic anaemia secondary to infection with Mycoplasma wenyonii. This report of a novel presentation of Mycoplasma wenyonii in a dairy cow illustrates the need to consider M.wenyonii as a potential differential diagnosis when a cow presents with anaemia and will discuss the potential implications of the condition at herd-level.