A comparative study of Lutz sedimentation technique, Kato thick-smear and Simões Barbosa techniques for S. mansoni egg counting in 211 stools samples, have shown: 1) A positivity of 50% with Lutz sedimentation and Simões Barbosa techniques against 58,1% with Kato thick-smear technique. 2) The Kato thick-smear showed a greater number of eggs compared with Simões Barbosa technique. 3) Finally, a higer sensitivity, simplicity and lower cost of Kato thick-smear technique and its possibility to preserve the S. mansoni eggs for more than 4 months have shown an aávantage for this method.