Virus
•Viruses are very simple and small organisms that cannot reproduce outside a living cell. Therefore, they do not multiply in or on foods.
•Viruses can contaminate food through foodservice workers' poor hygiene, and can be present in contaminated food and water supplies, or shellfish harvested from sewage-contaminated waters.
•Two of the commonest foodborne viruses
•Norovirus
•Hepatitis A virus