Wright R C
J Hyg (Lond). 1986 Feb;96(1):75-82. doi: 10.1017/s0022172400062550.
Natural water sources used as drinking-water supplies by rural settlements in Sierra Leone were examined monthly over a one-year period to detect any seasonal variations in bacterial quality. The 37 degrees C colony count, levels of selected faecal indicator bacteria and the incidence of Salmonella spp. were monitored. A seasonality was demonstrated for all the variables, counts generally increasing with the progression of the dry season, culminating in peaks at the transition from dry to wet season. Some complications with respect to the interpretation of counts of faecal indicator bacteria from raw tropical waters are noted.
在一年的时间里，每月对塞拉利昂农村定居点用作饮用水源的天然水源进行检测，以发现细菌质量的任何季节性变化。监测了37摄氏度下的菌落计数、选定的粪便指示菌水平以及沙门氏菌属的发生率。所有变量均呈现出季节性变化，计数通常随着旱季的推进而增加，在旱季向雨季过渡时达到峰值。文中指出了一些关于解读来自热带生水的粪便指示菌计数的复杂情况。
