Antibiotic-resistant Pseudomonas in bottled drinking water.

Area of Science:

• Microbiology
• Environmental Science
• Pharmaceutical Science

Background:

• Pseudomonas species are opportunistic pathogens found in various environments.
• Antibiotic resistance in Pseudomonas poses a significant public health challenge.
• Bottled water represents a potential reservoir for microbial contamination.

Purpose of the Study:

• To investigate the diversity of Pseudomonas populations in bottled drinking water.
• To assess the antibiotic sensitivity profiles of recovered Pseudomonas species.
• To determine if Pseudomonas species distribution and antibiotic sensitivity differ among bottled water brands.

Main Methods:

• Weekly sampling of eight bottled water brands over an eight-month period.
• Isolation and identification of Pseudomonas species using standard microbiological techniques.
• Antibiotic sensitivity testing against eight clinically relevant antibiotics.

Main Results:

• Nine Pseudomonas species were identified, with Pseudomonas stutzeri (24%) and Pseudomonas diminuta (18.8%) being the most prevalent.
• Significant differences in antibiotic sensitivity patterns were observed between environmental and clinical isolates.
• Statistical analysis revealed significant effects of antibiotic type, Pseudomonas species, and a strong species-antibiotic interaction on inhibition zone sizes.
• The distribution of Pseudomonas species varied significantly across different bottled water brands (68% of paired comparisons).

Conclusions:

• Bottled drinking water contains a diverse range of Pseudomonas species.
• Pseudomonas isolates from bottled water exhibit varying antibiotic sensitivity profiles.
• The findings highlight the importance of monitoring microbial quality in bottled water and understanding potential reservoirs for antibiotic-resistant bacteria.