Ehrlichia risticii
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Potomac horse fever
- Caused by Ehrlichia risticii
- Occurs during the summer
- Fluke vector
- Infects epithelial cells of colon and Monocytes, macrophages and mast cells
- Clinical signs
- Fever, anorexia, depression, diarrhoea, colic, leukopenia, laminitis
- 30% mortality
- Can cause abortion
- Hyperaemia of large intestine at post mortem
- Diagnosis
- Seroconversion detected by indirect immunofluorescence or ELISA
- Treatment and control
- Oxytetracycline for 1 week
- Inactivated vaccines