Bovis ISSN 2398-2993
Synonym(s): M. wenyonii, Eperythrozoon wenyonii
Contributor(s): Ben Strugnell
, James Breen
- Class: Mollicutes.
- Order: Mycoplasmatales.
- Family: Mycoplasmataceae.
- Genus: Mycoplasma.
- Species: wenyonii.
- Formerly known as Eperythrozoon wenyonii.
- Other clinically significant members of this group include:
- Myocplasma suis which affects pigs.
- Mycoplasma haemofelis which affects cats.
- Although thought to be host-specific, some species have been reported to be zoonotic.
- Gk: myco - fungus; plasma- form; mycoplasma - a fungus form.
Clinical signs in dairy cows gradually resolve but full recovery may take 10 days or longer.
- Hindlimb edema (hindlimbs 'fill up' with pitting edema to mid-tibia, although affected cows not usually lame).
- Exactly how this blood borne parasite with a tropism for the erythrocyte membrane causes or contributes to clinical signs of hindlimb and udder edema is not yet understood, research is ongoing.
- Examination of biopsy samples, from edematous skin, has indicated that the edema may be caused by vasculitis, possibly an Arthus-type reaction with deposition of immune complexes in the vascular endothelium.
- In some cases, there has been an association with recent vaccination, raising the possibility of immune stimulation by adjuvants and precipitation of immune-mediated pathology.
- Pyrexia - may result in milk drop, malaise and inappetence.
- Painful, swollen udders in dairy cows.
- Milk drop Investigating milk drop in the herd. Investigating milk drop in the individual cow
- Prefemoral lymph nodes are enlarged and easily palpable.
- Scrotal edema (could have significant effects on male fertility).
- A case has been reported (Gladden 2015) of a cow presenting with post-calving vaginal bleeding, which on investigation was found to have a regenerative anemia and tested positive for M wenyonii. This animal had suffered milk drop but had no hind-limb edema. The authors concluded that in this case the anemia was associated with M wenyonii.
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