| Abstract: | In 392 samples from 14 balneological therapeutic pools and two swimming pools with untreated and chlorinated water of 15… 30 °C the following species were found in 72% of the samples (percentage of positive samples): Acanthamoeba polyphaga (10.5), A. castellani (3.7), Naegleria gruberi (5.9), N. lovaniensis (12.7), Vahlkampfia ustiniana (7.2), V. spec. (15.8), Hartmanella vermiformis and H. exudans (13.1), H. spec. (31.2). 47% of the positive findings grew also at 37 °C, 9% of them also at 44 °C. The average densities amounted to between 27 and 777 ind./l, the maxima were between 66 and more than 1000 ind./l. Neither heterotrophic bacteria nor amoebas could be detected in 25 samples, in the other samples a significant regression exists between the number of amoebas per litre A and the number of bacteria N/ml of the form lg A=0.47 × lg N + 1.22. Because of the danger of the occurrence of pathogenic amoebas, too, in the bathing pool waters, the analysis for amoebas is recommended to check the bathing water. As a temporary working level, the absence of amoebas in a sample of 100 ml is proposed. |
