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Coliphage counts were carried out without using any sort of contrast or magnification; 45 and 50 counts were performed, respectively, on the undiluted and 10-fold diluted river samples; 43 samples of sewage diluted at 100-, 1,000-, 10,000-fold were titrated, but in the case of the most diluted sewage samples, only 21 samples could be taken into account in this study due to the limited coliphage presence. The results are summarised in Table 1.

Table 1

Overall coliphage titration results

Sample	Time (h)	n	Mean	SD	Min.	Max.	Sample	Time (h)	n	Mean	SD	Min.	Max.
Sewage (1:100)	2	43	181.23	38.68	96	268	River	2	45	53.47	24.69	10	124
	3	43	244.07	47.11	24	336		3	45	83.58	32.89	27	158
	4	43	266.91	48.80	149	352		4	45	97.80	35.38	37	176
	5	43	280.65	50.33	158	362		5	45	105.84	37.01	42	192
	6	43	292.67	52.94	162	384		6	45	112.18	37.66	44	195
	18	43	311.86	50.67	180	396		18	45	127.44	39.19	52	214
Sewage (1:1,000)	2	43	17.49	5.32	6	32	River (1:10)	2	50	4.14	2.89	0	11
	3	43	26.19	7.56	8	42		3	50	6.94	4.10	0	21
	4	43	30.12	9.09	11	48		4	50	8.36	4.53	0	23
	5	43	32.04	9.42	12	49		5	50	9.14	4.76	0	25
	6	43	34.35	10.14	13	50		6	50	9.76	4.77	2	26
	18	43	40.16	11.29	18	59		18	50	12.40	5.42	4	29
Sewage (1:10,000)	2	21	2.00	1.84	0	8
	3	21	2.86	1.90	0	8
	4	21	3.62	2.56	0	11
	5	21	3.86	2.37	1	11
	6	21	4.04	2.50	1	11
	18	21	5.10	2.90	1	13

Sample	Time (h)	n	Mean	SD	Min.	Max.	Sample	Time (h)	n	Mean	SD	Min.	Max.
Sewage (1:100)	2	43	181.23	38.68	96	268	River	2	45	53.47	24.69	10	124
	3	43	244.07	47.11	24	336		3	45	83.58	32.89	27	158
	4	43	266.91	48.80	149	352		4	45	97.80	35.38	37	176
	5	43	280.65	50.33	158	362		5	45	105.84	37.01	42	192
	6	43	292.67	52.94	162	384		6	45	112.18	37.66	44	195
	18	43	311.86	50.67	180	396		18	45	127.44	39.19	52	214
Sewage (1:1,000)	2	43	17.49	5.32	6	32	River (1:10)	2	50	4.14	2.89	0	11
	3	43	26.19	7.56	8	42		3	50	6.94	4.10	0	21
	4	43	30.12	9.09	11	48		4	50	8.36	4.53	0	23
	5	43	32.04	9.42	12	49		5	50	9.14	4.76	0	25
	6	43	34.35	10.14	13	50		6	50	9.76	4.77	2	26
	18	43	40.16	11.29	18	59		18	50	12.40	5.42	4	29
Sewage (1:10,000)	2	21	2.00	1.84	0	8
	3	21	2.86	1.90	0	8
	4	21	3.62	2.56	0	11
	5	21	3.86	2.37	1	11
	6	21	4.04	2.50	1	11
	18	21	5.10	2.90	1	13

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