Food and Drinking Water as Sources of Pathogenic Protozoans: An Update
2024
Franca Rossi | Serena Santonicola | Carmela Amadoro | Lucio Marino | Giampaolo Colavita
This narrative review was aimed at collecting updated knowledge on the risk factors, illnesses caused, and measures for the prevention of protozoan infections transmitted by food and drinking water. Reports screened dated from 2019 to the present and regarded global prevalence in food handlers, occurrence in food and drinking water, impact on human health, and recently reported outbreaks and cases of severe infections attributable to the dietary route. <i>Cryptosporidium</i> spp., <i>Cyclospora cayetanensis</i>, <i>Entamoeba histolytica</i>, and <i>Cystoisospora belli</i> were the protozoans most frequently involved in recently reported waterborne and foodborne outbreaks and cases. <i>Blastocystis hominis</i> was reported to be the most widespread intestinal protozoan in humans, and two case reports indicated its pathogenic potential. <i>Dientamoeba fragilis</i>, <i>Endolimax nana</i>, and <i>Pentatrichomonas hominis</i> are also frequent but still require further investigation on their ability to cause illness. A progressive improvement in surveillance of protozoan infections and infection sources took place in developed countries where the implementation of reporting systems and the application of molecular diagnostic methods led to an enhanced capacity to identify epidemiological links and improve the prevention of foodborne and waterborne protozoan infections.
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