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This study investigated the quantitative risk assessment of total coliform and fecal coliform in drinking water from drinking water dispenser in Thammasat University, Rangsit Centre as a biological risk assessment. The risk assessment method recommended by The Codex Alimentarius Commission (CAC) was used in this study. The number of microorganisms contaminated in drinking water dispenser was conducted in Thammasat University, Rangsit Centre. The first area (1st area) was cafeteria and lecture buildings and the second area (2nd area) was dormitories. The results were analyzed by a multiple tube fermentation technique and calculated based on the mathematical equations. The results showed that water from the 1st area had a higher of probability of exposure (PE) and probability of infection (Pi) with total coliform and fecal coliform than those of the 2nd area. The probabilities of exposure and probability of infection total coliform were 0.3529 and 3.69347E-05, respectively. In addition, the probabilities of exposure and probability of infection fecal coliform were 0.1733 and 2.01388E-06, respectively. Moreover, the probabilities of infection and exposure of total coliform and fecal coliform can be reduced by cleaning the water dispenser system and adding the dispenser’s cover in order to prevent contamination in the dispenser.
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