Foodborne Viruses

definition

Last update: 13/05/2026

[1], [2], [3], [4], [5]

Foodborne viruses represent a diverse group of non-enveloped, obligate intracellular pathogens characterized by their small size (∅=20–400nm) and high environmental stability. They consist of genetic material surrounded by one or more protective layers of phospholipids, polysaccharides and/or proteins. They lack their own metabolism and require a ‘host’ cell to reproduce. Foodborne infections occur primarily through the fecal-oral route, occurring from contaminated water, food products, food handled with poor hygienic practices, or food in contact with animal waste, human sewage or sewage-polluted water.

The majority of viral foodborne illnesses of public health concern globally as recognized by Codex Alimentarius, the European Food Safety Authority (EFSA), and the U.S. Food and Drug Administration (FDA) include Norovirus (NoV), Hepatitis A (HAV) and E (HEV) and Rotavirus (RoV).

Norovirus is the most common cause of acute gastroenteritis globally. 
The burden of norovirus is significant; norovirus causes an estimated 200,000 deaths per year, including 50,000 child deaths, primarily impacting low-income countries. Norovirus is estimated to cost $60 billion worldwide due to healthcare costs and lost productivity. [6]

There are five hepatitis viruses (A to E), but only A and E are transmitted via the fecal-oral route. HAV is typically linked to poor hygiene and contaminated produce, while HEV is increasingly recognized for zoonotic transmission via undercooked pork products. Both are significant causes of infectious disease, leading to substantial socio-economic consequences due to morbidity and, in vulnerable populations, mortality. [5]

Rotavirus-associated disease typically occurs in children less than 5 years of age but can infect all ages, including adults. The vast majority of children are infected before the age of 3 years, and in most developing countries before the first birthday. In 2008, an estimated 453,000 deaths worldwide were attributed to rotavirus infection, with most deaths occurring in resource-poor countries [5], [7].

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