Intestinal infection with flagellated protozoan parasite.
Transmission is via the faecal-oral route. Personal hygiene is key to prevention.
Symptoms vary from asymptomatic passage of cysts to acute self-limiting diarrhoea or chronic diarrhoea. Growth retardation in children has been well described.
Diagnosis is by detection of cysts or trophozoites in a stool sample.
Metronidazole or tinidazole is recommended as first-line treatment.
Giardiasis is an enteric infection caused by a eukaryotic, flagellated, binucleated protozoan parasite called Giardia lamblia . First described in 1681, it is a major cause of diarrhoeal disease in human beings and other mammals.   A minority of individuals experience an abrupt onset of abdominal cramps, watery diarrhoea, vomiting, foul flatus, and fever lasting 3-4 days before proceeding into a more sub-acute phase. Most individuals develop gradual symptoms that become recurrent or resistant.
Memorial Hermann Southwest Hospital
MW declares that he has no competing interests.
Infectious Diseases Attending
Seton Medical Center Williamson
FAK declares that he has no competing interests.
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