Why foodborne and waterborne parasites are important for veterinarians.

Parasites, including helminths and protists, are pathogens responsible for waterborne and foodborne illnesses in both developed and developing countries. Their global incidence is difficult to estimate, but the World Health Organization (WHO) has indicated the global disease burden of 11 waterborne and foodborne parasitic diseases, is responsible for causing over 407 million illnesses resulting in an estimated of 94 K deaths and 11 million disability-adjusted life years (DALYs). Nevertheless, compared with bacteria and viruses, parasites are often overlooked as etiological agents of foodborne or waterborne disease; this is due to a variety of reasons, including the difficulty of their identification in environmental matrices and because many have a prolonged period between infection and symptoms, making it difficult to implicate infection vehicles. This Special Issue comprises 17 articles that include the more significant waterborne and foodborne parasites of zoonotic importance due to their relevance, with all groups of parasites (protist, cestodes, trematodes, and nematodes) being represented. Each chapter covers relevant aspects regarding -the importance of the parasite in food and water, including an overview of outbreaks where relevant, information on fundamental epidemiological aspects such as transmission, lifecycle and host range, clinical aspects such as pathogenesis, diagnosis and treatment, a summary of prospects for control in water or the food chain, and, finally, providing the authors' opinions regarding future research or studies required to improve control of transmission to people via food or water.