AUTHOR=Mahmud Md. Shahin , Hosen Md. Aoulad , Hossion Md. Ishaq , Sadik Sabuj Md. Shiblee , Rumi Nazmi Ara , Hossain Md. Khaled , Dauelbait Musaab , Nafidi Hiba-Allah , Dawoud Turki M. , Ibrahim Muhammad , Bourhia Mohammed 

TITLE=Isolation, identification, and characterization of resistant bacteria to antibiotics from pharmaceutical effluent and study of their antibiotic resistance

JOURNAL=Frontiers in Microbiology

VOLUME=14

YEAR=2023

URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2023.1307291

DOI=10.3389/fmicb.2023.1307291

ISSN=1664-302X

ABSTRACT=<p>Pharmaceutical effluents primarily enter aquatic environments through the discharge of treated and untreated wastewater from various sources, including hospitals, pharmaceutical manufacturing facilities, and households. Microbes sourced from pharmaceutical effluents such as <italic>Pseudomonas</italic> spp. pose a significant public health concern because of their high levels of resistance to multiple drugs and extreme multidrug resistance. Therefore, the present study was conducted for the isolation, identification, and molecular characterization of selected isolates from pharmaceutical effluents and also determined their antibiotic sensitivity patterns. From June 2016 to March 2017, a study was conducted on four well-known pharmaceutical companies specializing in antibiotic production in Dhaka and Gazipur. Four wastewater samples were collected from various origins and then brought to the Bacteriology laboratory for microbiological examination. Twelve pure isolates were obtained and characterized through cultural and biochemical tests while molecular identification of <italic>Pseudomonas</italic> spp. was performed using the 16S rRNA gene sequence. Twelve commercially available antibiotics were used for antibiotic sensitivity tests using Kirby-Bauer disk diffusion methods. We isolated the most predominant isolates, <italic>Pseudomonas aeruginosa</italic> (41.67%), followed by <italic>Bacillus</italic> spp. (33.33%) and <italic>Staphylococcus</italic> spp. (25%) respectively. Among 12 antibiotics, ciprofloxacin is 100% sensitive against <italic>P. aeruginosa,</italic> while the remaining 11 antibiotics are 100% resistant. <italic>Bacillus</italic> spp. showed 100% resistance to all antibiotics while 50% sensitive to vancomycin and 100% to chloramphenicol, respectively. <italic>Staphylococcus</italic> spp. was 100% resistant to all antibiotics. Our research suggested that <italic>P. aeruginosa</italic> is the reservoir of antibiotic resistance genes and spreads disease to humans from the environment. The findings of this study, i.e., the isolation, identification, and characterization of antibiotic-resistant bacteria from pharmaceutical effluent have highlighted, comprehended, and mitigated the dissemination of antibiotic resistance and opportunistic bacteria.</p>