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Cryptosporidium species are apicomplexan parasites that infect the microvillus border of the gastrointestinal epithelium of a wide range of vertebrate hosts, including humans.Infected individuals show a wide spectrum of clinical presentations, but the pathogenicity of Cryptosporidium varies with the species of parasites involved and also the type, age, and immune status of the host. Cryptosporidium infections are associated with only acute, self-limiting illness while in animals or individuals who are immune-suppressed; the infection is frequently chronic and can eventually be lethal....

Bacteria are the most common pathogens of cultured warm water fish, and cause major losses to the freshwater aquaculture in Egypt and elsewhere. Fish species commonly affected include carp, tilapia, eel, catfish, salmon and trout. Many potentially pathogenic bacteria of fish normally exist in a commensal association with the host or live free in the environment. Both these types of bacteria become pathogenic when the fish is immuno-compromised by some form of stressors. Human infections caused by pathogens transmitted from fish or the aquatic environment are quite common and depend on the...