antibiotic resistance

This study focused on the isolation and identification of bacteria from environmental hot spots using dumpsites located within Oredo Local Government Area of Benin City, Edo State, Nigeria, as reference points. The investigation aimed to assess the bacterial load, identify predominant microbial species, and evaluate their antibiotic susceptibility patterns. Ten samples were collected from various dumpsite points and analyzed using standard microbiological procedures. Total heterotrophic bacterial counts (THBC) ranged from 5 × 10⁴ to 1.25 × 10⁶ CFU/mL on MacConkey and EMB agars, indicating high microbial activity and organic contamination. Four representative isolates were further characterized biochemically and identified as Escherichia coli (three isolates) and Pseudomonas spp. (one isolate). Antibiotic susceptibility testing using the disk diffusion method revealed that all isolates were highly sensitive to fluoroquinolones (ofloxacin, ciprofloxacin, peflacine) and aminoglycosides (gentamicin, streptomycin) but exhibited strong resistance to β-lactam antibiotics such as ceporex and cefuroxime. The dominance of E. coli reflects fecal contamination of the dumpsites, while the presence of Pseudomonas spp. highlights the persistence of environmental opportunistic pathogens. The results suggest that these dumpsites represent potential reservoirs of antibiotic-resistant bacteria with implications for public health and environmental safety. This study emphasizes the urgent need for improved waste management, microbial monitoring, and enforcement of environmental sanitation standards to mitigate the spread of antimicrobial resistance in Benin City and other urban areas of Nigeria.

Background: Antimicrobial resistance (AMR) is a critical global public health threat, significantly driven by the irrational use of antibiotics. University students represent a key demographic whose medication-related behaviours influence community resistance patterns. This study assessed the knowledge, attitudes, and practices (KAP) regarding antibiotic use and resistance among undergraduate students of the University of Benin, Edo State. Methods: A descriptive cross-sectional study design was employed. A total of 430 students were selected using a multi-stage probability sampling technique across eight faculties. Data were collected using a structured, pre-tested, interviewer-administered questionnaire. Analysis was performed using IBM SPSS version 27.0, utilizing descriptive statistics and Chi-square tests to determine associations between variables. Statistical significance was set at p < 0.05. Results: The mean age of respondents was 20.3 ± 2.9 years. The study revealed a high prevalence of antibiotic use, with 58.8% of students having used an antibiotic in the preceding six months. Overall, 81.6% of respondents demonstrated poor knowledge of antibiotics and AMR. Misconceptions were widespread: 78.1% incorrectly believed antibiotics are effective against viral infections (flu/coughs), and only 10.0% correctly identified the biological mechanism of resistance. Attitudes were predominantly negative (70.2%); notably, 51.0%perceivedsharingleftover antibiotics as a "helpful social gesture." Regarding practices, 50.7%demonstratedpoorbehaviour. The most common source of antibiotics was Patent and Proprietary Medicine Vendors xiv (29.3%), while only 18.8% obtained drugs via a doctor’s prescription. Faculty of study (p=0.005)and Level of study (p=0.005) were significantly associated with knowledge levels, with medical students and seniors performing better. Attitude was a significant predictor of practice(p<0.001). Conclusion: There is a concerning deficit in antibiotic literacy and a high prevalence of inappropriate practices among students at the University of Benin. The reliance on unregulated vendors and the social normalization of medication sharing underscore the need for urgent interventions. It is recommended that the University administration integrates antimicrobial stewardship modules into the General Studies (GST) curriculum and strengthens the campus health services to reduce reliance on informal medication sources.

Groundwater and borehole water remain a vital source of drinking water in many Nigerian cities, yet their quality is often compromised by physicochemical and microbial contamination. This study assessed the physicochemical and bacteriological analysis on water sources in University of Benin Ekenwan Campus Benin City, Edo State, Nigeria. A total of eighteen water samples
were collected from six hostel locations including Notre Dame, Uniben Table Water, Bore-hole source Water, Boy’s hostel, Postgraduate hostel, and Girl’s hostel, and analysed using the method of A.O.A.C. The microbiological analysis was analysed using standard microbiological methods. The results revealed that physicochemical analysis revealed that pH values of the
water ranged between 4.58 and 6.38, falling below the FEPA acceptable limit of 6.5–8.5. Most physicochemical parameters analysed were below permissible limits, however, iron (0.56–1.06 mg/L) and chromium (0.10–0.25 mg/L) exceeded the FEPA limits of 0.3 mg/L and 0.05 mg/L respectively. Microbiological results showed high contamination across hostel water samples. Presumptive coliform counts ranged from 6.67×10³ cfu/ml (Notre Dame) to 2.83×10⁴ cfu/ml (Boys hostel), aerobic bacterial counts ranged from 6.67×10³ cfu/ml (Notre Dame) to 8.67×10⁴ cfu/ml (Postgraduate hostel), while fungal counts ranged from 1.00×10¹ sfu/ml (Notre Dame) to 2.00×10² sfu/ml (Boys hostel). The microbial results exceeded WHO and FEPA permissible
standards. Identified bacteria include Staphylococcus aureus, Corynebacterium spp., Aeromonas hydrophila, Pseudomonas fluorescens, Klebsiella aerogens, Enterobacter aerogens and Chromobacterium violaceum, Penicillium notatum, Aspergillus flavus, Aspergillus niger and Microsporum audouinii. Among bacteria, K. aerogens had the highest occurrence (21.9 %)
while A. hydrophila had the least occurrence (9.4 %). Among fungi, A. flavus (35.7%) was the most frequently occurring, while M. audouinii (14.3 %) had the lowest occurrence. Antibiotic sensitivity testing before plasmid curing showed multidrug resistance across isolates. Staphylococcus aureus displayed resistance to amoxicillin, augmentin, pefloxacin, azithromycin, and ceftriaxone, with the highest multidrug resistant index (MDRI) of 0.8. Pseudomonas fluorescens and Enterobacter aerogens each had an MDRI of 0.5, while Corynebacterium spp. and Chromobacterium violaceum exhibited MDRI values ranging from 0.2 to 0.3. After plasmid curing, resistance was lost in several isolates, with A. hydrophila, S. aureus, Corynebacterium spp., P. fluorescens, K. aerogens and C. violaceum showing susceptibility to tested antibiotics. This study demonstrated that while physicochemical parameters of water sources in Ekenwan Campus were largely within permissible limits except for iron and chromium, the
microbiological quality was grossly compromised. The detection of multidrug resistant organisms, both plasmid-mediated and chromosomal, highlights the public health risk associated with these water sources. The findings confirm that water supplied in these hostels is unsafe for direct consumption and requires adequate treatment and disinfection to reduce risks of waterborne infections and antibiotic-resistant outbreaks in the student community

This study accessed the microbial analysis of melon seeds purchased from different vendors in New Benin market, Ogida market, Oba market and Uselu market in Benin City, Edo state, Nigeria. Samples were collected in sterile plastic containers and taken to the laboratory for microbiological assessment following standard procedures. The microbiological assessment was carried out using cultural techniques. Identification of the microbial isolates was done using biochemical methods, phenotypic virulence properties were evaluated for the isolates and antimicrobial sensitivity was carried out using agar well diffusion method. The results showed that the bacterial counts ranged from 1.96±0.67 to 3.45±1.15x105 CFU/g. The total coliform counts ranged from 4.73±0.67 to 9.66±0.67 x103 CFU/g. The fungal counts ranged from 1.00±0.00 to 6.00±0.58x103 CFU/g. The bacterial isolated from the melon seed samples were Bacillus sp, Escherichia coli, Pseudomonas sp and Staphylococcus aureus. The fungal isolates identified were Aspergillus flavus, Aspergillus niger, Rhizopus sp, Penicillium chrysogenum, Fusarium sp and Trichoderma sp respectively. The antibacterial susceptibility testing showed that all isolates were susceptible to ciprofloxacin, erythromycin and levofloxacin but were also resistant to pefloxacin, gentamycin, ampiclox, zinnacef, amoxicillin and rocephin. It was also evident that all isolates were found to have an MAR index greater than 0.2 which means that the isolates were all pathogens of public health importance. The study therefore suggests regular surveillance and checks to monitor local vended foods on sale to ensure effective food safety.