With respect to water treatment, chlorination was the first option used in many HEV outbreak scenarios until a study suggested that chlorinated water does not reduce the risk of infection(Guthmann et al., 2006). During that period, there were no studies addressing HEV disinfection, due to methodological limitation sand a lack of cell culture assays to evaluate virus viability after treatment. The above study caused some organizations that were assisting HEV outbreaks to use other water treatment methodsinstead, such ultraviolet (UV) radiation. However, there is no avail-able experimental information concerning the efficiency of UV disinfection for HEV.