국문 초록
Background: As pollutants caused by non-point sources flow into rivers, river water quality monitoring for
fecal pollution is becoming increasingly important.
Objectives: This study was conducted to investigate the distribution of microbial communities in the
Yeongsangang River water system and sewage treatment plants in Gwangju and to evaluate their antibiotic
resistance.
Methods: In the experiment, samples were distributed to five selective media at each point and then cultured
for 18 to 24 hours. When bacteria were observed, they were sub-cultured by size and shape and identified
using MALDI-TOF MS equipment. When identification was completed, 17 types of antibiotic susceptibility
tests were performed using VITEK II equipment, focusing on gram-negative dominant species among the
identified strains.
Results: During the study period, a total of 266 strains were isolated from 39 samples. Gram-positive bacteria
were 37 strains in four genera, or 13.9% of the total, and Gram-negative bacteria were 229 strains in 23 genera,
or 86.1% of the total. Antibiotic susceptibility testing of 23 strains, the major dominant species, showed that
one strain (4.3%) was resistant to only one antibiotic, and two strains (8.7%) were 100% susceptible to the
17 antibiotics tested. The other 20 strains (87.0%) were multidrug resistant bacteria resistant to two or more
antibiotics. There were various types of multidrug resistance. Among them, penicillin and cephalosporin
series showed the highest resistance.
Conclusions: Based on the results of this study, it was found that the bacterial community structure changed
according to regional and environmental factors, and it was judged that continuous research such as genetic
analysis of antibiotic-resistant bacteria present in natural rivers is necessary.
영문 초록
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