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Giardiasis is a more frequent intestinal parasitosis in children than in adults and whose etiological agent is Giardia lamblia.

This flagellated protozoan has a higher incidence in temperate climates. To gender Giardia belongs to the first human intestinal protozoan to be known. His description is attributed to Leeuwenhoek who noticed 'tiny moving animals' in his own feces.


Giardiasis manifests as heartburn and nausea that decrease in intensity when food ingestion occurs, cramps followed by diarrhea, loss of appetite, irritability. Rarely, mucus or blood is observed in the stools of individuals with giardiasis that, however, have a foul odor, are explosive and are accompanied by gas.

In some cases the acute state of the disease can last months leading to malabsorption of various substances including vitamins such as fat soluble, for example.


Occurs when mature cysts are ingested by the individual. Cysts can be found in water (even chlorinated), contaminated food, and in some cases transmission can occur through contaminated hands.


Basically, to prevent giardiasis one should take the same prophylactic measures used against amoebiasis as the forms of contamination are virtually the same. Therefore one should:

  • Only eat well washed and / or cooked food;
  • Wash hands before meals and after using toilets;
  • Construction of sewers and sewers;
  • Only drink filtered and / or boiled water;
  • Treat sick people.