Virus
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Viruses are very simple and small organisms that cannot reproduce outside a living cell. Therefore, they do not multiply in or on foods.
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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.
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Two of the commonest foodborne viruses
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Norovirus
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Hepatitis A virus