Presence of presumptive Escherichia coli in randomly sampled street-vended sweet dipping sauces across Dumaguete City / by Neilsen Jae P. Gallegos and Irene C. Cinco.

By: Contributor(s): Material type: TextDescription: xii, 86 leaves : ill. (some color.) ; photographs ; 28 cm. leavesContent type:
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  • CAS (Bio-Th) LG 221 D35 A78 A5 B56 2025 G35
Dissertation note: Undergraduate thesis (BS in Biology) -- Foundation University, 2025. Summary: ABSTRACT The study assesses the contamination of street-vended sweet dipping sauces in Dumaguete City by presumptive Escherichia coli, a key indicator of fecal pollution. Samples collected from three high-traffic vending sites were subjected to standard microbiological analyses, revealing a notable presence of E. coli. A total of 4.8% of the samples were identified as presumptive positive for E. coli. Site-specific analysis showed variability in contamination levels, with NORSU Main Campus 1 recording the highest proportion of positives (16.7%), followed by Escaño (3.7%), while no presumptive E. Coli was detected in samples from Rizal Boulevard. However, statistical analysis using Chi-square goodness of fit test indicated no significant differences in overall E. Coli occurrence. Furthermore, logistic regression analysis showed that physicochemical parameters including pH, temperature, total dissolved solids, and salinity, were not significantly associated with presumptive E. coli positivity. These findings highlight the risks posed by handling and environmental conditions, emphasizing the need for improved food safety practices among street vendors to mitigate public health threats. Keywords: Escherichia coli, street food, dipping sauces, microbial contamination, food safety, fecal indicator bacteria, presumptive detection, EMB agar
List(s) this item appears in: Biology, Bachelor of Science in (2026)
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Thesis Foundation University Library Undergraduate Thesis Non-fiction CAS (Bio-Th) LG 221 D35 A78 A5 B56 2025 G35 (Browse shelf(Opens below)) Room Use Only 0072026035008

Undergraduate thesis (BS in Biology) -- Foundation University, 2025.

Includes bibliographical references and appendixes.

ABSTRACT
The study assesses the contamination of street-vended sweet dipping sauces in
Dumaguete City by presumptive Escherichia coli, a key indicator of fecal pollution. Samples
collected from three high-traffic vending sites were subjected to standard microbiological
analyses, revealing a notable presence of E. coli. A total of 4.8% of the samples were
identified as presumptive positive for E. coli. Site-specific analysis showed variability in
contamination levels, with NORSU Main Campus 1 recording the highest proportion of
positives (16.7%), followed by Escaño (3.7%), while no presumptive E. Coli was detected in
samples from Rizal Boulevard. However, statistical analysis using Chi-square goodness of fit
test indicated no significant differences in overall E. Coli occurrence. Furthermore, logistic
regression analysis showed that physicochemical parameters including pH, temperature,
total dissolved solids, and salinity, were not significantly associated with presumptive E. coli
positivity. These findings highlight the risks posed by handling and environmental
conditions, emphasizing the need for improved food safety practices among street vendors
to mitigate public health threats.
Keywords: Escherichia coli, street food, dipping sauces, microbial contamination, food
safety, fecal indicator bacteria, presumptive detection, EMB agar

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