Where It Comes From
Rivers, lakes, sewage, fish and shellfish, and biofilms in drinking-water systems and home plumbing [2][1].
How You Are Exposed
Swallowing untreated or poorly disinfected water; getting freshwater in your mouth while swimming; exposing cuts to lakes, rivers, or floodwater; eating undercooked seafood or produce washed with contaminated water [1][2].
Why It Matters
Can cause diarrhea, vomiting, stomach cramps, and skin/wound infections; rarely leads to bloodstream infections. Illness is usually mild but can be severe in some people [1].
Who Is at Risk
Young children, older adults, and people with weakened immune systems or chronic illnesses; anyone with open wounds exposed to freshwater [1][2].
How to Lower Your Exposure
Drink treated water; maintain and test private wells, especially after floods; avoid swallowing water when swimming; keep wounds out of freshwater and clean them promptly; flush stagnant taps; cook seafood thoroughly; wash produce with safe water [1][2].
References
- [1]CDC Yellow Book 2024: Aeromonas species (Aeromonas hydrophila and others). Centers for Disease Control and Prevention.
- [2]WHO Guidelines for Drinking-water Quality, 4th ed. (Microbial Fact Sheets: Aeromonas). World Health Organization.
- [3]EPA Contaminant Candidate List (CCL) – Aeromonas. U.S. Environmental Protection Agency.