Seven species (A-G) of human mastadenovirus (HAdV) are known, and more than 100 types have been reported. HAdV is highly resistant to common hand sanitizers. Epidemic keratoconjunctivitis and pharyngoconjunctival fever caused by HAdV can be explosively transmitted in a confined space, resulting in outbreaks such as nosocomial infections.Given the absence of an antiviral agent for HAdV infection, it is important to prevent the spread of infection using disinfectants. The bactericidal and virucidal activities of ozone have already been known widely. ALTANT is an ozonated alcohol preparation developed by E-TECH Co., Ltd.