Which protozoan is known to cause gastrointestinal issues?

The protozoan responsible for causing gastrointestinal issues is classified as Dientamoeba fragilis, which can lead to symptoms such as diarrhea, abdominal pain, and nausea. This microorganism primarily affects the intestines and can disrupt normal digestive function, leading to various gastrointestinal disturbances. Although other protozoans listed, like Giardia lamblia and Entamoeba histolytica, are also known for causing gastrointestinal issues, Dientamoeba fragilis stands out due to its unique pathogenic mechanisms and symptomatology.

In particular, Giardia lamblia is typically associated with giardiasis, presenting similar gastrointestinal symptoms but known for its specific life cycle and transmission routes. Entamoeba histolytica is the causative agent of amoebic dysentery, causing severe diarrhea and other extensive intestinal complications. Cryptosporidium parvum causes cryptosporidiosis, often leading to diarrhea, especially in immunocompromised individuals. Each of these pathogens has distinct characteristics and methods of interaction with the human gastrointestinal system.