Lucy J. Robertson - Böcker

Although widely recognized as an important waterborne pathogen, Giardia duodenalis can also be transmitted by contamination of food. The same properties of this protozoan parasite that mean that water is an excellent transmission vehicle are also important for foodborne transmission. These include the low infective dose, the high number of cysts that are excreted, and the robustness of these transmission stages. However, many more outbreaks of waterborne giardiasis have been reported than foodborne outbreaks. This is probably partly due to epidemiological tracing being much more difficult for foodborne outbreaks than waterborne outbreaks, and the number of persons exposed to infection often being fewer. Nevertheless, the potential importance of foodborne transmission is gradually being recognized, and a wide range of different foodstuffs have been associated with those outbreaks that have been recorded. Additionally, various factors mean that the potential for foodborne transmission is becoming of increasing importance: these include the growth of international food trade, a current trend for eating raw or very lightly cooked foods, and the rise in small-scale organic farms, where there the possibility for contamination of vegetable crops with animal faeces may be greater. ​

Although widely recognized as an important waterborne pathogen, Cryptosporidium spp. can also be transmitted by contamination of food. The same properties of this protozoan parasite that mean that water is an excellent transmission vehicle are also important for foodborne transmission. These include the low infective dose, the high number of oocysts that are excreted, and the robustness of these transmission stages. However, many more outbreaks of waterborne cryptosporidiosis have been reported than foodborne outbreaks. This is probably partly due to epidemiological tracing being much more difficult for foodborne outbreaks than waterborne outbreaks, and the number of persons exposed to infection often being fewer. Nevertheless, the potential importance of foodborne transmission is gradually being recognized, and a wide range of different foodstuffs have been associated with those outbreaks that have been recorded. Additionally, various factors mean that the potential for foodborne transmission is becoming of increasing importance: these include the growth of international food trade, a current trend for eating raw or very lightly cooked foods, and the rise in small-scale organic farms, where there the possibility for contamination of vegetable crops with animal feces may be greater.

This Brief provides a comprehensive overview of Trypanosoma cruzi, a parasite that is traditionally considered as exclusively vectorborne, but can be foodborne, and may lead to outbreaks of Chagas disease in consumers. The characteristics of Trypanosoma cruzi and the clinical effects of the disease are covered, including documented outbreaks, regional patterns, and epidemiology. The various transmission routes are outlined, but with specific focus on foodborne transmission. A major emphasis of this text is contamination of fruit juices with Trypanosoma cruzi in, a transmission vehicle with increasing significance in the spread of this parasite. Also outlined is the difficulty of establishing a protocol for detection in food samples. Results on survival of Trypanosoma cruzi in food matrices is considered, as well as current risk assessment procedures and regulations. Different approaches to preventing transmission, including inactivation and decontamination are introduced, but also the importance of targeted educational initiatives, and also with a focus on future detection, prevention, and prevention of contamination of foods with this parasite.