Department of Microbiology, Gifu University School of Medicine, Tsukasa-Machi 40, Gifu 500, Japan.
Appl Environ Microbiol. 1992 Apr;58(4):1394-7. doi: 10.1128/aem.58.4.1394-1397.1992.
Our survey of cooling tower water demonstrated that the highest density of legionellae, >/=10 CFU/100 ml, appeared in water containing protozoa, >/=10 MPN/100 ml, and heterotrophic bacteria, >/=10 CFU/100 ml, at water temperatures between 25 and 35 degrees C. Viable counts of legionellae were detected even in the winter samples, and propagation, up to 10 CFU/100 ml, occurs in summer. The counts of legionellae correlated positively with increases in water temperature, pH, and protozoan counts, but not with heterotrophic bacterial counts. The water temperature of cooling towers may promote increases in the viable counts of legionellae, and certain microbes, e.g., protozoa or some heterotrophic bacteria, may be a factor stimulating the propagation of legionellae.
我们对冷却塔水的调查表明，在水温为 25 至 35 摄氏度之间、含有原生动物（>=10MPN/100ml）和异养菌（>=10CFU/100ml）的水中，军团菌密度最高（>=10CFU/100ml）。即使在冬季水样中也检测到了活的军团菌计数，并且在夏季会繁殖到 10CFU/100ml。军团菌的数量与水温、pH 值和原生动物数量的增加呈正相关，但与异养细菌数量无关。冷却塔的水温可能会促进军团菌活菌数的增加，某些微生物，例如原生动物或某些异养细菌，可能是刺激军团菌繁殖的因素。
