Delayed reduction of Anaplasma marginale parasitemia and packed cell volume normalization despite prolonged enrofloxacin treatment of cattle co-infected with Trypanosoma vivax
Although co-infections of Trypanosoma vivax , Anaplasma spp., and Babesia spp. have been reported, knowledge gaps remain that need to be addressed. The present study evaluated the efficacy of enrofloxacin (7.5 mg/kg) against A. marginale in naturally infected cattle and cattle experimentally co-infe...
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Veröffentlicht in: | Parasitology research (1987) 2021-08, Vol.120 (8), p.2929-2937 |
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Zusammenfassung: | Although co-infections of
Trypanosoma vivax
,
Anaplasma
spp., and
Babesia
spp. have been reported, knowledge gaps remain that need to be addressed. The present study evaluated the efficacy of enrofloxacin (7.5 mg/kg) against
A. marginale
in naturally infected cattle and cattle experimentally co-infected with
T. vivax
by observation of the variation in
A. marginale
parasitemia and packed cell volume (PCV) for 39 days. Bovines were distributed into two groups, each with six calves: T01 = animals immunosuppressed with dexamethasone and with latent anaplasmosis; T02 = animals immunosuppressed with dexamethasone, with latent anaplasmosis and experimentally co-infected with
T. vivax
on day 0 (D0). Animals of both groups were immunosuppressed with dexamethasone and received enrofloxacin (7.5 mg/kg) whenever mean values of parasitemia for
A. marginale
were ≥ 5% per group. Cattle of group T02 were also treated with isometamidium chloride (0.5 mg/kg) on D25. On D17 and D22 to D28 of the study, there was a higher (P ≤ 0.05)
A. marginale
parasitemia in animals of T02 than in those of T01. Animals of T01 required one enrofloxacin treatment to decrease
A. marginale
parasitemia, while those from T02 needed five treatments. From D5 to D37 of study, the mean values of PCV for calves from T02 were lower (P ≤ 0.05) than that for calves from T01. In conclusion, bovines co-infected
T. vivax
needed four more treatments with enrofloxacin to reduce
A. marginale
parasitemia and keep PCV values within reference standards. |
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ISSN: | 0932-0113 1432-1955 |
DOI: | 10.1007/s00436-021-07226-4 |