Katz, Naftale, Fábio Zicker, R. S. Rocha, and V. B. Oliveira. 1978. “Re-Infection of Patients in Schistosomiasis Mansoni Endemic Areas After Specific Treatment. I Lnfluence of Age and Worm Burden”. Revista Do Instituto De Medicina Tropical De São Paulo 20 (05): 273-78. https://revistas.usp.br/rimtsp/article/view/197712.