Efficacy of an enzyme-linked immunosorbent assay in the diagnosis of and serologic distinction between acute and chronic Schistosoma mansoni infection - Valli, L. C. P.; Kanamura, Hermínia Yohko; Silva, Rita Maria da; Silva, M. I. P. G.; Vellosa, S. A. G.; Garcia, E. T. (American Journal of Tropical Medicine and Hygiene, 1997)