Table 1.

Impact of chlorine concentration (0.5, 1 and 2 μg/ml) and contact time (15 and 30 min) on inactivation of free and A. polyphaga-ingested Map NCTC 8578 in water.

Chlorine concentration (μg/ml)	15 min contact time		30 min contact time
	Free Map	Ingested Map	Free Map	Ingested Map
	Log10 reduction (mean ± s.d.)
0.5	1.27 ± 0.75	0.22 ± 0.25	0.78 ± 0.65	0.16 ± 0.04
1	1.45 ± 0.98	0.51 ± 0.17	1.72 ± 1.05	0.63 ± 0.53
2	1.43 ± 1.24	0.32 ± 0.45	1.73 ± 1.18	0.94 ± 0.56