Bivalves are filter feeders that ingest particles from the surrounding water, including pathogens,which could cause illness in consumers. In Samar, Philippines no data on the microbial quality of undulatedsurf clam (Paphia undulata) have previously been reported. Thus, this study was conducted to determine themicrobial quality of the species in selected areas in Samar, Philippines (Pinabacdao, Zumarraga andVillareal). The total plate count (TPC) and total Vibrio count were beyond the standard limits set by the Foodand Drug Administration (FDA), although Salmonella was not detected in any samples. The TPC ofundulated surf clam was 5.9-6.3 log CFU·g-1 in Pinabacdao, 4.9-6.0 log CFU·g-1 in Zumarraga, and 6.3-7.2log CFU·g-1 in Villareal. The total Vibrio count was 5.1-5.7 log CFU·g-1 in Pinabacdao, 3.9-4.6 log CFU·g-1in Zumarraga, and 6.1 log CFU·g-1 in Villareal. Bivalves in these areas should undergo purification process,such as relaying or depuration
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