Subclinical canine ehrlichiosis: a healthy seropositive dog
5-year-old Podenco from Murcia, with no clinical signs and a positive Ehrlichia canis rapid test at a pre-donation check. Platelets 140,000/µL (200,000–500,000) and mildly increased globulins.
Which statement is correct?
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A. As it has no signs, the infection has resolved and it can be a donor
Absence of signs does not mean cure: the organism can persist and be transmitted by transfusion. A positive dog must not donate.
B. It should be treated with imidocarb, which is the treatment of choice
Imidocarb is an antiprotozoal and has not been shown to be effective against Ehrlichia canis. The treatment of choice is doxycycline.
C. It is probably in the subclinical phase, with persistence of the organism (mainly in the spleen); it is excluded as a donor, treated with doxycycline and the CBC is monitored
Correct. The subclinical phase may last months or years with mild thrombocytopenia and hyperglobulinaemia. With laboratory abnormalities, treatment is indicated and the dog is excluded from donation.
D. The subclinical phase does not progress, so repeating the test in a year is enough
Some dogs progress from the subclinical to the chronic phase, with pancytopenia and a poor prognosis. That is why periodic monitoring is needed.
lightbulb Key takeaway
Canine monocytic ehrlichiosis has an acute, a subclinical and, in some dogs, a chronic phase. In a healthy seropositive dog with normal bloodwork treatment is debated; with haematological changes, treat. Donors must test negative for the vector-borne pathogens of the region.
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Updated: October 31, 2026 · Educational content for veterinary professionals. It does not replace current clinical guidelines or the judgement of the attending veterinarian.