Viral pathogens
The viral pathogens discussed here are hepatitis A and noroviruses.
Hepatitis A
Hepatitis A virus is classified within the enterovirus group of the Picornaviridae family. Hepatitis A virus has a single molecule of ribonucleic acid (RNA) surrounded by a small (27 nm diameter), non-enveloped, protein capsid (FDA 2003).
Hepatitis A virus is distributed worldwide and is usually transmitted from person-to-person via the faecal-oral route. Hepatitis A virus is excreted in faeces of infected people and can infect susceptible individuals when they consume contaminated water or foods. Water, shellfish, and salads are the most frequent sources.
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