What is the reservoir of Vibrio parahaemolyticus and Vibrio vulnificus?

• A. Freshwater rivers
• B. Marine Coastal Environs
• C. Soil
• D. Domestic animals

Answer: (B)

Vibrio parahaemolyticus and Vibrio vulnificus are most closely tied to warm marine coastal environments. These bacteria thrive in seawater and brackish water found in estuaries and along coastal shores, where salinity, temperature, and nutrient conditions promote their growth. That coastal reservoir explains why seafood from these areas, especially raw shellfish like oysters, can be a source of illness.

Freshwater rivers typically have too little salt for Vibrio to multiply as readily, making them a poor primary reservoir. Soil isn’t the usual habitat where these vibrios establish sustained populations, though they can be found in many environments at low levels. Domestic animals aren’t the natural reservoir for these species; they may become contaminated but the coastal marine environment is the main reservoir that supports their life cycle and transmission.