Efficacy of praziquantel against urinary schistosomiasis and reinfection in Senegalese school children where there is a single well-defined transmission period

Particle and Fibre Toxicology

Cheikh Sokhna⁵  Adiouma Diallo⁵  Cheikh Tidiane Bâ¹  Idrissa Talla²  Mouhamadane Seye³  Seydou Nourou Sylla⁴  Souleymane Doucoure⁵  Omar Talla Diaw³  Bruno Senghor¹ 

[1] Département de Biologie Animale, Université Cheikh Anta Diop de Dakar, Dakar BP 5005, Senegal;Programme national de lutte contre les bilharzioses et les géo-helminthiases, ministère de la santé et de l’action sociale, Dakar, Sénégal;Institut Sénégalais de Recherches Agricoles, ISRA, route des Hydrocarbures, Bel Air, Dakar, Senegal;UFR Sciences Appliquées et Technologies, Université Gaston Berger de Saint Louis, Saint Louis BP 234, Senegal;Institut de Recherche pour le Développement, UMR 198 (URMITE), Campus International de Hann, IRD, BP 1386, Dakar CP 18524, Sénégal

关键词: Senegal;    Niakhar;    Reinfection;    Praziquantel treatment;    Seasonal transmission;    Urinary schistosomiasis;   

Others  :  1222252
DOI  :  10.1186/s13071-015-0980-5

 received in 2015-05-19, accepted in 2015-07-01,  发布年份 2015

【 摘 要 】

Background

Human schistosomiasis is a significant health problem in Sub-Saharan Africa. In Niakhar, West central Senegal, the transmission of S. haematobium occurs seasonally between July and November. No control measures have been implemented despite high prevalence reported in previous studies. This aim of this study was to i) determine the current prevalence of S. haematobium in children at Niakhar, ii) assess the efficacy of one dose of PZQ (40 mg/kg) against S. haematobium and iii) monitor reinfection.

Methods

The current study was carried out in a cohort of 329 children aged five to 15 years enrolled from six villages in Niakhar to determine the efficacy of one dose of PZQ, as well as reinfection. Parasitological screening was performed in June 2011 to determine the baseline prevalence of S. haematobium, and then a single dose of PZQ was administered to all selected subjects in the transmission season in August 2011. The efficacy of PZQ treatment and reinfection were monitored respectively five weeks after in September 2011 and from February to March 2012.

Results

At baseline, the overall prevalence and the heavy intensity of infection were 73.2 % and 356.1eggs/10 ml of urine. Significant differences in the prevalence and intensity of S. haematobium infection were noted between villages. A single dose of PZQ significantly reduced the prevalence of S. haematobium infection from 73.2 % to 4.6 % and the geometric mean intensity of infection from 356.1 to 43.3 eggs/10 ml of urine. The cure rates ranged from 89.4 % to 100 %. The egg reduction rates also ranged from 77.6 % to 100 %. Two to three months after the period of transmission, the overall rate of reinfection was 12.6 % and was significantly higher in male children than in female children. The overall prevalence at this period was 13.8 %, which was significantly lower than the prevalence at baseline (73.2 %).

Conclusion

The Niakhar study area remains a hot spot of urinary schistosomiasis in Senegal with differences in transmission between villages. This study suggests that when transmission is strictly seasonal, Praziquantel shows the expected efficacy in reducing the prevalence and intensity of infection, but also a significant effect on the occurrence of reinfection.

【 授权许可】

   
2015 Senghor et al.

【 图 表 】

Fig. 1.

Fig. 2.

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