“…Unfortunately, the results from these campaigns could not be properly investigated, although such evaluations would have been extremely important for disease control efforts. In experimental field studies conducted on a smaller scale, Prata (1970, 1974) in Bahia, Katz et al (1977Katz et al ( , 1980 in Minas Gerais (MG) and Coura et al ( , 1984Coura et al ( , 1992, Conceição and Borges-Pereira (2002) and Conceição et al (2007) in other areas of MG have demonstrated the possibility of reducing the rates and intensities of infection among treated individuals who remained in the endemic area. Furthermore, they have shown a reduction in the progression of the disease to severe forms.…”