Natural poliovirus isolants from drinking water show significantly higher chlorine resistance than standard laboratory strains, questioning the adequacy of free chlorine residual standards.
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May question free chlorine standards for water treatment; leaves open whether natural poliovirus strains require revised disinfection protocols.
Poliovirus 1 isolants were recovered from finished drinking water produced by a modern, well-operated water treatment plant. These waters contained free chlorine residuals in excess of 1 mg/liter. The chlorine inactivation of purified high-titer preparations of two such isolants was compared with the inactivation behavior of two stock strains of poliovirus 1, LSc and Mahoney. The surviving fraction of virus derived from the two natural isolants was shown to be orders of magnitude greater than that of the standard strains. These results raise the question whether indirect drinking water standards based on free chlorine residuals are adequate public health measures, or whether direct standards based on virus determinations might be necessary.
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Shaffer et al. (1980) studied this question.
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