Bates R C, Shaffer P T, Sutherland S M
Appl Environ Microbiol. 1977 Dec;34(6):849-53. doi: 10.1128/aem.34.6.849-853.1977.
A laboratory strain of poliovirus (LSc) became progressively more resistant to chlorine inactivation during a series of repeated sublethal exposures to the halogen.