Inactivation of bacteriophages MS2 (a) and ϕX174 (b) by Ag30-MHCs exposed to tap and surface water. First, Ag30-MHCs were exposed to tap water or to surface water samples (F, filtered; NF, nonfiltered) from the Han River in a shaking incubator (150 rpm, 10 min, 25°C). Then, the bacteriophages were added to the water samples in a shaking incubator (150 rpm, 1 h, 25°C). Values are expressed as means ± standard deviations (SD) from three independent experiments. Asterisks indicate significantly different values (P < 0.05 by Kruskal-Wallis one-way ANOVA with Dunnett's test).