PS-01-024 Viral antigens are more frequently observed in acute interstitial pneumonia than in other types of idiopathic interstitial pneumonias E. Parra * , G. C. dos Santos, F. Weisshaupt Stegun, C. dos Santos Cirqueira, M. I. Seixas Duarte, V. L. Capelozzi * FMUSP, Dept. of Pathology, São Paulo, Brazil