Giardiasis is caused by giardia lamblia which is a waterbourne protozoan parasite. It is the most common human protozoan enteropathogen worldwide.
Symptoms of giardia infection range from none, to a mild self-limiting gastroenteritis to chronic diarrhoea with fatigue, weight loss, cramps, greasy stools and malabsorption.
Incubation period 7 to 15 days.
- foreign travel
- fresh water swimming
- green salad
In addition to transmission via contaminated water person-to-person transmission has been noted, for example in the daycare environment.
Espelage, W. et al. Characteristics and risk factors for symptomatic Giardia lamblia infections in Germany. BMC Public Health. 2010; 28(10): 41.
Shandera, W. From Leningrad to the day-care center. The ubiquitous Giardia lamblia. West J Med. 1990; 153(2): 154-159.