Microbiology and the Investigation of Waterborne Outbreaks: Typing of Norwalk-Like Virus

Thus the epidemiological cohorts at risk are large, and infections and reinfections ensure the vitality of these viruses. In contrast, the well-established diarrheal viruses such as rota-, astro-, and adenoviruses mainly affect small children. Immunity to these viruses is much longer lasting, so symptomatic reinfections are rare.