Abstract
The objectives of this study were to assess the bacteriological quality of tap water samples obtained from different markets of different upazillas of Mymensingh, Sherpur & Gazipur district. For achieving the above mentioned objectives, methods of heterotrophic plate count (HPC) and total coliform count (TCC) were applied. Moreover, isolated E. coli from tap water samples were characterized by using biochemical test, molecular method and antimicrobial susceptibility tests. HPC was highest in market tap water collected from Kaligonj and TCC was highest in market tap water of collected from Mymensingh sadar. The geometric mean of HPC of Mymensingh, Gazipur and Sherpur districts water was 8.4x105, 2.5 x106 and 6.8 x105 C.F.U/100 ml. All isolates of E. coli (n=20) were amplified by using 16S rRNA gene based PCR. In respect to antimicrobial susceptibility testing, most of the E. coli isolates were susceptible to norfloxacin, ampicilin, tetracycline, streptomycin and ciprofloxacin. Furthermore, a few E. coli isolates were intermediate resistant to gentamycin and ciprofloxacin. However, a few of the E. coli isolates were resistant to erythromycin and amoxycilin. Moreover, out of 20 E. coli isolates 3 (15%) isolates were detected as multidrug resistant. This study indicated the presence of multidrug resistant E. coli isolates in tap water in Mymensingh, Sherpur and Gazipur districts that warrants particular attention.
 Asian Australas. J. Food Saf. Secur. 2018, 2(1), 21-28
Highlights
According to the World Health Report (2002), every year more than 3.4 million people die as a result of water related diseases indicating these as the leading cause of disease and death around the world
In case of Gazipur District, highest Heterotrophic Plate Count (HPC) count was found in Tap water of TW12 and the count was 6.5×106 C.F.U /ml. and the lowest count was in Tap water of TW14 and the count was 8×105 C.F.U /ml
Results of isolation and identification of E. coli from tap water A total of 20 E. coli strains were isolated from 20 tap water samples by using cultural and biochemical techniques
Summary
According to the World Health Report (2002), every year more than 3.4 million people die as a result of water related diseases indicating these as the leading cause of disease and death around the world. Humid, tropical region of Bangladesh, outbreaks of diarrheal diseases, often on an epidemic scale, are not unusual and the possible role of water-borne pathogens in these outbreaks has been emphasized. Despite the availability and promotion of the use of safe water sources, waterrelated diseases remain an important cause of mortality and morbidity in Bangladesh and it is suggested that intake of contaminated water acts an important mode of pathogen transmission (Kabir et al, 2015). Even if disinfection is practiced in water supply systems, but failure of the disinfection system due to poor management could result in serious health hazards and post contamination.
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