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The present study showed that the coliphage strains isolated by us have a high variation in their resistance against chlorine disinfection (Table 2). Coliphages were grouped into three categories: chlorine-resistant, intermediately chlorine-resistant, and sensitive to chlorine (Table 3). The chlorine treatment can easily destroy the intermediate and sensitive coliphages. In our work, as many as 7 of 18 tested coliphages (almost 40%) belonged to the chlorine-resistant group and they were difficult to destroy with chlorine concentrations typical in drinking water disinfection.

Table 3

Grouping of coliphage strains to chlorine-resistanta, intermediateb, and sensitivec based on statistically significant differences between the slopes of linear regression equations (Log10-reduction = k*Clfree)d of the strains (*p < 0.05, Kruskal–Wallis test)

 Resistanta
Intermediateb
GroupsStrains1576171413MS21143
Sensitivec 10 0.015* 0.038* 0.043*         
9 0.004* 0.011* 0.013* 0.022* 0.049*       
2 0.002* 0.006* 0.007* 0.013* 0.029*       
12 0.001* 0.003* 0.003* 0.006* 0.015* 0.027* 0.049*     
16 0.001* 0.002* 0.002* 0.005* 0.012* 0.022* 0.040*     
15 0.000* 0.002* 0.002* 0.004* 0.100* 0.020* 0.036*     
8 0.000* 0.000* 0.000* 0.001* 0.002* 0.005* 0.010* 0.026* 0.040*   
 Resistanta
Intermediateb
GroupsStrains1576171413MS21143
Sensitivec 10 0.015* 0.038* 0.043*         
9 0.004* 0.011* 0.013* 0.022* 0.049*       
2 0.002* 0.006* 0.007* 0.013* 0.029*       
12 0.001* 0.003* 0.003* 0.006* 0.015* 0.027* 0.049*     
16 0.001* 0.002* 0.002* 0.005* 0.012* 0.022* 0.040*     
15 0.000* 0.002* 0.002* 0.004* 0.100* 0.020* 0.036*     
8 0.000* 0.000* 0.000* 0.001* 0.002* 0.005* 0.010* 0.026* 0.040*   

The table shows only the statistically significant p-values.

aResistant coliphage strains are statistically significantly different from 4 to 7 sensitive strains.

bIntermediate coliphage strains are statistically significantly different from 0 to 1 sensitive strains.

cSensitive coliphage strains are statistically significantly different from 3 to 9 resistant strains.

dData for linear regression equation are presented in Table 2.

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