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The study were to evaluated the efficacy of hypochlorous acid (HOCl) solution (HAS) against norovirus (NV). Exposing virus-contaminated carriers of ceramic tile (porous) and stainless steel (non-porous) to 200-20 ppm of HOCl solution resulted in >/=99.9 % (>/=3 log10) reductions of both infectivity and RNA titer within 10 min. HOCl fogged in a confined space reduced the infectivity and RNA titers of NV, MNV-1 and MS2 on these carriers by at least 99.9% (3 log10). Applied Environmental Microbiology 2007;May 4.