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Secretory Diarrhea.

Infectious: viral damage to mucosal epithelium

Rotavirus
Caliciviruses
Enteric adenoviruses
Astroviruses

Infectious: enterotoxin mediated

Vibrio cholerae
Escherichia coli
Bacillus cereus
Clostridium perfringens

Infectious: damage to mucosal epithelium

Shigella
Salmonella
Campylobacter
Entamoeba histolytica

Neoplastic

Tumor elaboration of peptides, serotonin, prostaglandins
Villous adenoma in distal colon (nonhormone mediated)

Excess laxative use.