Giardiasis, caused by the protozoan Giardia intestinalis, is the leading cause of intestinal parasitic infections in humans ...

The pathogens Giardia duodenalis and Cryptosporidium are common causes of sometimes-fatal intestinal diseases in humans, ...

For more information on any of these, see the Centers for Disease Control Web site (www.cdc.gov). Giardia: Giardiasis refers to a syndrome of diarrhea, excess gas, and abdominal cramping. It is caused ...