ABSTRACT
The aim of this study was to evaluate the accuracy of routine hematoxylin and eosin histology stain to diagnosis circovirosis, compared to immunohistochemistry, and to evaluate the intensity and frequency of PCV2 infection in different organs. One hundred thirty-three routine histologic cases with circovirosis-suggestive lesions in different organs were used. A porcine anti-PCV2 polyclonal antibody was used for optimizing an indirect immunohistochemistry (IHC) technique with dilutions ranging from 1:100 to 1:2500. This IHC stain was performed in all studied cases for detection of positive and negative samples. Intensity of infection was also determined in each organ. Eight-two cases were positive for PCV2 by IHC. Infection was most often detected in lymph nodes, 66 cases (56.9%), followed by intestines (55.5%), kidneys (46.6%), lungs (37.5%), spleen (34.4%) and liver (26.6%). Despite of the reduced number of intestine samples (n = 9), the high frequency of infection in this organ was surprising. The results clearly demonstrated the need for IHC in order to confirm routine histologic cases with suspicion of circovirosis.
KEY WORDS
Swine; circovirus type 2; circovirosis; immunohistochemistry
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