recovered from clinical equine ehrlichiosis were refractory to detectable re-infection and subsequent clinical disease when they were again exposed to blood infected with E equi 300 days after infection (Nyindo 1978). Equine ehrlichiosis should be differentiated from primary liver disease, purpura haemorrhagica, equine viral arteritis, encephalitis and equine infectious anaemia. In France, equine ehrlichiosis should be differentiated from equine babesiosis caused by Babesia cabali, although clinical signs and laboratory results are similar for both conditions. Buffy coat smears aid diagnosis but, as they are not performed routinely for each suspected case, the prevalence of equine ehrlichiosis in France could be underestimated. E18-U-4 GroupA-A-GroupB-41-GroupOC-4-Group 0 16. 1 .2 14-12-10
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