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Parasitology Research

, Volume 98, Issue 6, pp 545–549 | Cite as

The efficacy of human schistosomicide treatment may depend on the rate of transmission

  • Nelmar García
  • Gina Isturiz
  • Silvia Aular
  • Renzo Nino IncaniEmail author
Original Paper

Abstract

The efficacy of different treatment protocols in humans infected with Schistosoma mansoni at sites with different transmission conditions was evaluated by the disappearance of anti-worm intestine IgM antibodies in an indirect fluorescence antibody test (IgM-IFT) and anti-egg antibodies in the circumoval precipitin test (COPT). Patient sera coming from sites of active low transmission (ALT), active high transmission (AHT) and low interrupted transmission (LIT) from Venezuela were studied. Chemotherapy protocols were (1) ALT, 60 mg/kg praziquantel (Pzq60); (2) AHT, one dose of 40 mg/kg Pzq followed by one dose of 20 mg/kg oxamniquine for one group and one dose of 40 mg/kg Pzq alone for the other group; (3) LIT, one dose of 40 mg/kg Pzq repeated every 3 months up to three doses. Cure rates occurred mostly between 3 and 12 months with the exception of Pzq60-ALT where it was evident before 3 months. Higher cure rates were evident in both places of low transmission (ALT and LIT) and the lowest in the AHT regardless of the treatment protocol. Cure was more evident with COPT compared to IgM-IFT. The rate of serological cure appears then to depend on the previous state of transmission. The differential cure rate evaluated by both techniques is probably due to the persistence of antibodies against antigens in different stages of the parasite.

Keywords

Schistosomiasis Treatment Transmission rate Praziquantel Oxamniquine COPT Immunofluorescence 

Notes

Acknowledgements

The basic clinical and epidemiological work in the communities of Los Naranjos and Seitifero was part of two undergraduate theses of the medical doctors Ruth Salas, Ingrid Sánchez, Ronald Rodríguez and Francisco García. The team for laboratory and field work, in addition to the authors and those already mentioned, responsible for handling the communities studied and obtaining human biological samples and parasite antigens were (1) Bioanalist Marta Eblen, Lab Technicians María de los Angeles Pinto, Lorena Medina, Yanett Saez, María Simons and Sinecio Rivas (from Universidad de Carabobo, Valencia; (2) Dr. Lisbeth Loaiza, Bioanalists Haydee Fuentes and Marietta Díaz, Lab Technicians Angélica Méndez and Lourdes Sánchez, Sanitary Inspectors Pedro Velásquez Gómez, Douglas González, Carlos Vera and John Córdoba (from INSALUD-Carabobo state); (3) Engineer Carlos Balzán, Drs. Trina Camejo and Carmen Sierra, Bioanalist Lourdes Sánchez, Lab Technicians Yesenia Soler and Ana Uzcátegui, Sanitary Inspector Alexis Guevara (from the Dirección de Endemias Rurales, Maracay) and (4) Dr. Italo Cesari, MS Diana Ballén, Bioanalist Leidy Mendoza (from the Instituto Venezolano de Investigaciones Científicas, Caracas). Our gratitude also to Profs. Gustavo Morales (INIA-FONAIAP, Maracay) and José A. García (Universidad de Carabobo) for advice with the statistical analysis. The work carried out comply with current Venezuelan laws.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Nelmar García
    • 1
  • Gina Isturiz
    • 1
  • Silvia Aular
    • 1
  • Renzo Nino Incani
    • 1
    Email author
  1. 1.Departamento de Parasitología, Facultad de Ciencias de la SaludUniversidad de CaraboboValenciaVenezuela

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