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Protozoa in the Intestinal Lumen
- Molecular classification
- Eukaryotic Microorganism, Protozoa
01
Overview
Protozoa in the intestinal lumen are single-celled eukaryotic organisms residing within the cavity of the human gastrointestinal tract. They exist as either harmless commensals or pathogens causing various gastrointestinal illnesses. Pathogenic species such as Entamoeba histolytica and Giardia lamblia can lead to significant morbidity. Transmission occurs primarily through the fecal-oral route, and diagnosis involves microscopic examination of stool samples.
- Other names
- Intestinal ProtozoaGut ProtozoaLumen-dwelling Protozoa
02
Mechanism of action
Metronidazole and Tinidazole: Disrupt protozoal DNA and inhibit nucleic acid synthesis; Nitazoxanide: Inhibits pyruvate:ferredoxin oxidoreductase (PFOR) enzyme pathway; Paromomycin: Inhibits protein synthesis by binding to the 16S rRNA of the protozoal ribosome
03
Biological functions
Nutrient absorption (Trophozoite)Replication (Trophozoite)Transmission (Cyst)Mucin interactionIntestinal colonization
04
Disease associations
Amebiasis (Entamoeba histolytica)Giardiasis (Giardia lamblia)Balantidiasis (Balantidium coli)Cryptosporidiosis (Cryptosporidium parvum)Isosporiasis (Isospora belli)DiarrheaDysenteryMalabsorption syndromes
05
Safety considerations
Drug resistanceAdverse drug reactionsPotential for asymptomatic carriage and transmission
06
Interacting drugs
Metronidazole
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