Abstract
In May 2000, examinations of 2 instances of epidemicPneumocysitis cariniiin pigsinfected with Porcine circovirus type 2 (PCV-2) on a farrow-to-finish pig farm showed that clinical symptoms occurred mostly in pigs, about 8 weeks old. Extreme emaciation resulted in the deaths of from 5 to 10% of the pigs. Immunohistochemical staining revealedP.cariniiin a foamy eosinophilic mass clinging to the thick alveolar septa. Immunohistochemical staining also revealed the PCV-2 antigen in several lymph nodes. In addition PCR detected characteristic PCV-2 DNA in the tonsils and spleen.
