This study was conducted to assess the occurrence and nature of extended-spectrum beta lactamase (ESBL) producing <em>Escherichia coli</em> and <em>Klebsiella pneumoniae</em> isolates from pati...This study was conducted to assess the occurrence and nature of extended-spectrum beta lactamase (ESBL) producing <em>Escherichia coli</em> and <em>Klebsiella pneumoniae</em> isolates from patients who presented with urinary tract infection at Federal Teaching Hospital Gombe. Isolates collected were recovered on MacConkey agar at 35<span style="white-space:nowrap;">°</span>C and were identified as members of Enterobacteriaceae, and further screened for antimicrobial susceptibility and resistance by disc diffusion method. Isolates resistant to oxyimino-cephalosporins were confirmed as ESBL producers using Double Disks Synergy Test (DDST). The study shows 66% resistance to ceftriaxone (30 μg) in <em>K. pneumoniae</em>, which was the highest value recorded and a 51% resistance to cefpodoxime (10 <em>μ</em>g) in <em>E. coli</em>. The sensitivity of <em>E. coli </em>and <em>K. pneumoniae</em> isolates to cefpodoxime (10 <em>μ</em>g) were 49% and 33.9% respectively. ESBLs were detected among 40% (40/100) of <em>E. coli</em> and 54.13% (59/109) of <em>K. pneumoniae</em> isolates. Molecular characterization of ESBL encoding genes among <em>E. coli</em> isolates using multiplex-PCR showed 10% prevalence of SHV gene and 5% prevalence for CTX-M gene while TEM gene was not detected. In <em>K. pneumoniae</em> isolates, 5% prevalence was recorded for each of the three genes screened. The study revealed a co-occurrence of SHV and CTX-M in 75% of the <em>E. coli</em> and 70% of the <em>K. pneumoniae</em> isolates;the occurrence of all the three genes was seen in 10% and 5% of <em>K. pneumoniae</em> and <em>E. coli</em> respectively. Multiplex-PCR method provided an efficient and rapid detection of ESBL related genes, hence could be used in epidemiological studies among ESBL isolates. Monitoring dissemination and transmissions of ESBL producers are highly recommended for optimum patient care and preventing the spread of multidrug resistant (MDR) pathogens.展开更多
Lactic acid bacteria (LAB) strains from fermented cow milk (nono) sold inUnguwar Rimi, Kaduna markets were isolated on lactic bacteria specific medium (De Man Rogosa Sharpe MRS media). Isolated strains were identified...Lactic acid bacteria (LAB) strains from fermented cow milk (nono) sold inUnguwar Rimi, Kaduna markets were isolated on lactic bacteria specific medium (De Man Rogosa Sharpe MRS media). Isolated strains were identified and characterized using morphological, biochemical test and carbohydrate fermentation system (API-50 CHL). Six (6) pure colonies were distinctly obtained and identified as Lactobacillus strains. Out of the 6 isolated Lactobacilli, 5 were further identified as Lactobacillus delbrueckii ssp. lactis 2, Lactobacillus bulgaricus, Lactobacillus salivarius, Lactobacillus acidophilus 2 and Lactobacillus rhamnosus. They were further screened for antimicrobial activity and antibiotic sensitivity. Lactobacillus acidophilus had higher resistance to all but one of the antibiotics used (Chloramphenicol 30 μg) with no zone of inhibition to Ampicillin, Amoxicillin, Gentamycin, Penicillin, Streptomycin and Tetracycline. The antimicrobial activity against Escherichia coli exhibited varying degree of inhibitory activity. It can be concluded that the presence of these microorganisms in fermented cow milk (nono) is of great benefits to humans and animals either as supplements or food production processes.展开更多
文摘This study was conducted to assess the occurrence and nature of extended-spectrum beta lactamase (ESBL) producing <em>Escherichia coli</em> and <em>Klebsiella pneumoniae</em> isolates from patients who presented with urinary tract infection at Federal Teaching Hospital Gombe. Isolates collected were recovered on MacConkey agar at 35<span style="white-space:nowrap;">°</span>C and were identified as members of Enterobacteriaceae, and further screened for antimicrobial susceptibility and resistance by disc diffusion method. Isolates resistant to oxyimino-cephalosporins were confirmed as ESBL producers using Double Disks Synergy Test (DDST). The study shows 66% resistance to ceftriaxone (30 μg) in <em>K. pneumoniae</em>, which was the highest value recorded and a 51% resistance to cefpodoxime (10 <em>μ</em>g) in <em>E. coli</em>. The sensitivity of <em>E. coli </em>and <em>K. pneumoniae</em> isolates to cefpodoxime (10 <em>μ</em>g) were 49% and 33.9% respectively. ESBLs were detected among 40% (40/100) of <em>E. coli</em> and 54.13% (59/109) of <em>K. pneumoniae</em> isolates. Molecular characterization of ESBL encoding genes among <em>E. coli</em> isolates using multiplex-PCR showed 10% prevalence of SHV gene and 5% prevalence for CTX-M gene while TEM gene was not detected. In <em>K. pneumoniae</em> isolates, 5% prevalence was recorded for each of the three genes screened. The study revealed a co-occurrence of SHV and CTX-M in 75% of the <em>E. coli</em> and 70% of the <em>K. pneumoniae</em> isolates;the occurrence of all the three genes was seen in 10% and 5% of <em>K. pneumoniae</em> and <em>E. coli</em> respectively. Multiplex-PCR method provided an efficient and rapid detection of ESBL related genes, hence could be used in epidemiological studies among ESBL isolates. Monitoring dissemination and transmissions of ESBL producers are highly recommended for optimum patient care and preventing the spread of multidrug resistant (MDR) pathogens.
文摘Lactic acid bacteria (LAB) strains from fermented cow milk (nono) sold inUnguwar Rimi, Kaduna markets were isolated on lactic bacteria specific medium (De Man Rogosa Sharpe MRS media). Isolated strains were identified and characterized using morphological, biochemical test and carbohydrate fermentation system (API-50 CHL). Six (6) pure colonies were distinctly obtained and identified as Lactobacillus strains. Out of the 6 isolated Lactobacilli, 5 were further identified as Lactobacillus delbrueckii ssp. lactis 2, Lactobacillus bulgaricus, Lactobacillus salivarius, Lactobacillus acidophilus 2 and Lactobacillus rhamnosus. They were further screened for antimicrobial activity and antibiotic sensitivity. Lactobacillus acidophilus had higher resistance to all but one of the antibiotics used (Chloramphenicol 30 μg) with no zone of inhibition to Ampicillin, Amoxicillin, Gentamycin, Penicillin, Streptomycin and Tetracycline. The antimicrobial activity against Escherichia coli exhibited varying degree of inhibitory activity. It can be concluded that the presence of these microorganisms in fermented cow milk (nono) is of great benefits to humans and animals either as supplements or food production processes.
