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Porcine circovirus associated diseases (PCVAD) caused by porcine circovirus type-2(PCV-2) are emerging viral diseases with unfavourable effects on animal health and swine economy.We have a lot of information regarding the changes in the lymphoid organs and spleen in PCV-2infected pigs whereas the reason for anaemic changes in the carcasses and the pathologicaleffects of PCV-2 in bone marrow are still not well studied. Hence, an extensive study to identifythe changes in myeloid and erythroid cells of bone marrow in PCV-2 infected pigs was carriedout. Myeloid and erythroid series of cells were counted and analysed from the freshly collectedbone marrow cytological smears from the PCV-2 suspected samples. Later, PCV-2 infection wasconfirmed by polymerase chain reaction (PCR) and characteristic histopathological findings.The PCR yielded an amplicon of ~ 481 bp product and those positive cases were selected fordetermining the Myeloid to Erythroid ratio (M : E ratio). However, values did not significantly differin any of the cellular components between PCV-2 positive animals and PCV-2 negative animalswhich indicated that the bone marrow was not the specific target organ for PCV-2 viral infections.However, increased lympho-histiocytic and plasmacytic infiltration was noticed in both lymphoidand non-lymphoid organs. These characteristic features of PCV-2 infection could be considered asa major reason for increased proliferation of myeloid cells.

Myeloid to Erythroid (M: E) ratio in the evaluation of bone marrow cytology of Porcine Circovirus type 2 affected pigs