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Ehrlichiosis and anaplasmosis are tick-borne diseases.  Ehrlichia canis  and  Anaplasma platys  infect mainly white cells and platelets, respectively. The main DNA source for PCR is peripheral blood, but the potential of blood cell fractions has not been extensively investigated. This study aims at assessment of whole blood (WB) and blood fractions potential in nested PCR (nPCR) to diagnose canine ehrlichiosis and anaplasmosis. The 16S rRNA gene was amplified in 71.4, 17.8, 31.57, and 30% of the WB, granulocyte (G), mononuclear cells (M), and buffy coat (BC) samples. Compared to the WB, the sensitivity of the PCR was 42.86% for the M, and BC fractions, 21.43% for the G, and 33.33% for the blood clot (C). There was fair agreement between the WB and M, BC and C, and slight with the G. Fair agreement occurred between the nPCR and morulae in the blood smear. One animal was coinfected with  A. platys  and  E. canis . This study provided the first evidence of  A. platys  infection in dogs in Paraíba, Brazil, and demonstrated that WB is a better DNA source than blood fractions to detect  Ehrlichia  and  Anaplasma  by nPCR, probably because of the plasma bacterial concentration following host cell lysis.

An Assessment of Whole Blood and Fractions by Nested PCR as a DNA Source for Diagnosing Canine Ehrlichiosis and Anaplasmosis