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Isolation and Identification of Waterborne Antibiotic-Resistant Bacteria and Molecular Characterization of their Antibiotic Resistance Genes
Published on: March 3, 2023
Frequency and antimicrobial resistance of bacteria isolated from oral and topical medicaments from Hilla, Iraq
1Department of Microbiology, College of medicine, Babylon University, Iraq. aalcharrakh@yahoo.com
Introduction:
The presence of microorganisms in pharmaceuticals is undesirable because they may cause spoilage of the product and may present an infection hazard to the consumers or patients.
Methodology:
A total of 102 samples of oral and topical non-sterile pharmaceutical products were collected at random from different drug houses and pharmacies in Iraq, to investigate the microbial contamination of these products. Bacterial isolates recovered from these medicaments were subjected to susceptibility testing against various antibiotics by disk diffusion method according to Clinical and Laboratory Standards (CLSI) guidelines.
Results:
The results revealed that the occurrence of gram-positive bacteria was in oral and topical medicaments while gram-negative bacteria were only detected in topical medicaments. More than 58% of Bacillus isolates were resistant to lincomycin and Bacillus mycoides isolates were resistant to beta-lactam antibiotics and trimethoprim-sulfamethoxazole. Staphylococcus spp. showed a relatively high resistance to ampicillin, amoxicillin, penicillin, tetracycline, and trimethoprim-sulfamethoxazole. S. epidermidis had the highest number of multi-resistant isolates. Furthermore, 87.5% of isolated gram-negative rods showed high resistance to beta-lactam antibiotics and 75% of them were highly resistant to erythromycin. One isolate of Pseudomonas aeruginosa was the most resistant among all gram-negative rod isolates.
Conclusion:
The high rate of resistance to antimicrobial agents of bacterial isolates recovered from oral and topical medicaments in this study may indicate a widespread antibiotic resistance among bacteria isolated from different sources, including those of anthropological and environmental origin.
Insights
Microbial contamination is present in Iraqi pharmaceuticals, with significant antibiotic resistance observed in bacterial isolates from oral and topical products. This highlights a potential public health concern due to widespread antimicrobial resistance.
Area of Science:
- Microbiology
- Pharmaceutical Science
- Infectious Diseases
Background:
- Microbial contamination in pharmaceuticals poses spoilage and infection risks.
- Non-sterile oral and topical medications are susceptible to microbial presence.
Purpose of the Study:
- To investigate microbial contamination in non-sterile pharmaceutical products in Iraq.
- To assess the antibiotic susceptibility of isolated bacterial strains.
Main Methods:
- 102 samples of oral and topical non-sterile pharmaceuticals were collected.
- Bacterial isolates were identified and tested for antibiotic susceptibility using the disk diffusion method.
- Testing followed Clinical and Laboratory Standards Institute (CLSI) guidelines.
Main Results:
- Gram-positive bacteria were found in both oral and topical products; gram-negative bacteria were only in topical products.
- High resistance rates were observed: Bacillus spp. to lincomycin, beta-lactams, and trimethoprim-sulfamethoxazole; Staphylococcus spp. to ampicillin, amoxicillin, penicillin, tetracycline, and trimethoprim-sulfamethoxazole.
- Gram-negative rods exhibited high resistance to beta-lactam antibiotics and erythromycin, with Pseudomonas aeruginosa showing the highest resistance.
Conclusions:
- The study indicates a high prevalence of antibiotic resistance in bacteria from pharmaceutical products in Iraq.
- This resistance may reflect broader antimicrobial resistance patterns in environmental and anthropological sources.
- Findings underscore the need for monitoring and addressing antibiotic resistance in pharmaceutical supply chains.
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