Presently, there are four identified classes of enterovirulent Escherichia coli, which can be examined through microscopy under the microscope such as binocular compound microscope that cause gastroenteritis in humans. Among these classes are the enterotoxigenic or ETEC strains. They encompass a comparatively small proportion of the species and have been etiologically connected with diarrheal disease of all age groups from varied global places as verified by examinations done to its victims by means of microscopy using a microscope such as binocular compound microscope. The organism oftentimes causes diarrhea in babies in developing countries and in tourists there from industrialized countries. The etiology of this cholera-like disease has been acknowledged for approximately twenty years. Gastroenteritis is the usual name of the disease caused by enterotoxigenic Escherichia coli, although travelers’ diarrhea is a common sobriquet. The most recurrent clinical manifestation of contamination involves the watery diarrhea, low fever, malaise, abdominal cramps and nausea. The infective dose of this organism, based on a volunteer feeding science research studies, signify a comparatively large dose, approximately a hundred million to ten billion bacteria as examined via microscopy under the microscope like the binocular compound microscope, of enterotoxigenic Escherichia coli is possibly needed to establish colonization of the small intestine in which these organisms spread and generate toxins that induce fluid secretion. With high infective dose, diarrhea can be produced within twenty-four hours. Babies may require a fewer number of organisms for contamination to be established.

During the acute phase of contamination, huge numbers of enterotoxigenic cells are emitted in stools as observed with the aid of microscopy using a microscope such as binocular compound microscope. These strains are distinguished from nontoxigenic Escherichia coli emergent in the bowel by a diversity of in vitro immunochemical, tissue culture, or gene probe examinations designed to determine either the toxins or genes that encode for these toxins. Examinations usually involve microscopy in detecting the organisms being checked under the microscope such as binocular compound microscope. The diagnosis can be finished in approximately three days.
Enterotoxigenic Escherichia coli organism is not deemed as a severe foodborne illness hazard in countries having high sanitary standards and practices. Infection of water with human sewage may lead to infection of foods. Contaminated food handlers may also infect foods. These organisms are sporadically isolated from dairy products such as semi-soft cheeses.

Only four epidemics in the U.S. have been reported, one resulting from ingestion of water infected with human sewage, another from ingestion of Mexican food prepared by a contaminated food handler. In other two instances, one took place in a hospital cafeteria and another one aboard a cruise ship, food was the possible cause. The illness among travelers to foreign countries, nonetheless, is typical. The illness is commonly self-limiting. In babies or debilitated elderly persons, proper electrolyte replacement therapy may be required. Babies and tourists to developing countries are most at-risk of contamination. With the ease of use of a gene probe process, foods can be investigated directly for the existence of enterotoxigenic Escherichia coli, and the analysis can be finished in approximately three days. Alternative techniques that involve enrichment and plating of samples for isolation of Escherichia coli and their subsequent verification as toxigenic strains by traditional toxin assays may take a minimum of seven days.