Table 1.

Physical characterizations of water collected and cases of Acanthamoeba cultivated

	Type of sample		pH		Free residual chlorine (ppm)			Temperature (°C)
	Warm	Cold	6–7	7.1–8	0.2>	0.2	0.2<	20–30	31–40	41–50
No. of samples	21	73	89	5	13	61	20	78	8	8
Positive cases	11	34	43	2	7	30	8	35	5	5
Percentage	52.4	46.6	48.3	40	53.8	49.2	40	44.9	62.5	62.5