Dossou-Yovo J, Doannio J M, Diarrassouba S, Chauvancy G
Institut Pierre Richet/OCCGE, Côte d'Ivoire.
Bull Soc Pathol Exot. 1998;91(4):327-33.
This study evaluates the impact of rice fields in the city of Bouaké on anopheline fauna and malaria transmission. The Anopheles species represents between 11.4 to 39.2% of mosquitoes in the districts with rice fields and 5.2 to 47.8% in lowland districts with market-gardening. An. gambiae constitutes more than 98% of anopheline population in the city. In the lowland districts with market-gardening, biting rates of An. gambiae varied from 3650 to 6935 bites per man per year. Seasonal variations were correlated with rainfall. The mean annual parturity rate was 72% and the mean sporozoitic index 2%. Malaria transmission started at the beginning of the rainy season and attained its height during the second half of this season. Depending on the district, inhabitants were infected with 78 to 134 bites per year. The mean biting rate of An. gambiae in the districts with rice fields varied from 4745 to 22,630 bites per man per year. Seasonal variations were not correlated with rainfall, but with the growth of rice and the two annual cycles of rice cultivation. The parturity rates of the population of An. gambiae were low (46.2% to 57.2%), especially after rice transplantation. The mean infection rates were between 0.7 and 1.0%. The transmission period covered 7 to 11 months depending on the district with two annual peaks observed at the end of rice cultivation. Inhabitants were infected with 44 to 155 bites per year. Rice fields in Bouaké do not seem notably to have modified malaria transmission in the city.
本研究评估了布瓦凯市稻田对按蚊种群及疟疾传播的影响。在有稻田的地区，按蚊种类占蚊子总数的11.4%至39.2%，在有蔬菜种植的低地地区占5.2%至47.8%。冈比亚按蚊占该市按蚊种群的98%以上。在有蔬菜种植的低地地区，冈比亚按蚊的叮咬率为每人每年3650至6935次叮咬。季节变化与降雨量相关。年平均成熟率为72%，平均子孢子指数为2%。疟疾传播在雨季开始时启动，并在雨季下半年达到高峰。根据不同地区，居民每年被叮咬78至134次。在有稻田的地区，冈比亚按蚊的平均叮咬率为每人每年4745至22630次叮咬。季节变化与降雨量无关，而是与水稻生长及水稻种植的两个年度周期有关。冈比亚按蚊种群的成熟率较低（46.2%至57.2%），尤其是在水稻移栽后。平均感染率在0.7%至1.0%之间。传播期根据不同地区持续7至11个月，在水稻种植结束时出现两个年度高峰。居民每年被叮咬44至155次。布瓦凯市的稻田似乎并未显著改变该市的疟疾传播情况。
