Cercarial emergence pattern of Schistosoma haematobium from Libreville, Gabon Rodrigue Mintsa-Nguéma, Hélène Moné, Moudachirou Ibikounlé, Krystina Mengué-Ngou-Milama, Maryvonne Kombila and Gabriel Mouahid Parasite, 21 (2014) 3 Published online: 10 February 2014 DOI: 10.1051/parasite/2014004