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