Antibiotic resistance patterns of fecal coliforms isolated from domestic sewage before and after treatment in an aerobic lagoon

1978 ◽  
Vol 24 (7) ◽  
pp. 886-888 ◽  
Author(s):  
R. B. Bell
Keyword(s):  
Antibiotic Resistance ◽  
Domestic Sewage ◽  
Fecal Coliforms ◽  
Bacterial Survival ◽  
Fold Reduction ◽  
Loss Of Resistance ◽  
Significant Difference ◽  
Before And After ◽  
Resistance Patterns ◽  
Antibiotic Resistance Patterns

The resistance of 260 strains of fecal coliforms, isolated from raw domestic sewage and aerobic lagoon effluent, to ampicillin, aureomycin. Chloromycetin, gentamicin, streptomycin, sulfadiazine, and tetracycline, was determined. Aerobic lagoon treatment produced a 20-fold reduction in the fecal coliform numbers. No statistically significant difference in antibiotic resistance was observed between the fecal coliforms found in raw sewage and in lagoon effluent despite a trend towards the loss of resistance in the latter. Antibiotic resistance, either single or multiple, did not contribute to, or detract from, bacterial survival in the aerobic lagoon. Of the isolates, 15% showed resistance to two or more antibiotics.

Occurrence of Enteropathogenic Escherichia coli Serotypes in Butter

1987 ◽  
Vol 50 (10) ◽  
pp. 829-831 ◽  
Author(s):  
F. M. ABBAR ◽  
M. TAHIR MOHAMED
Keyword(s):  
Escherichia Coli ◽  
Antibiotic Resistance ◽  
Fecal Coliforms ◽  
Enteropathogenic Escherichia Coli ◽  
Heat Stable ◽  
Resistance Patterns ◽  
Antibiotic Resistance Patterns

A total of 30 samples of butter analysed during the course of the investigation showed that fecal coliforms were absent from only 13.3% of samples. One hundred forty colonies of fecal coliforms were biochemically characterized with the following types obtained (Escherichia sp. 41.4%, Enterobacter sp. 25.7%, Citrobacter sp. 20%, Klebsiella sp. 10%). Five different serotypes, namely 0 125 K70(2), 0 142K86(1), 0 127K63(1), 0 114 K90(2), 0 111 K58(1) were detected in 7 of 58 Escherichia coli isolates and 51 strains were untypable. Three strains produced heat stable (ST) enterotoxin and belonged to the enteropathogenic serotype. The antibiotic resistance patterns of coliform strains are presented.

scholarly journals Long-Term Shifts in Patterns of Antibiotic Resistance in Enteric Bacteria

2000 ◽  
Vol 66 (12) ◽  
pp. 5406-5409 ◽  
Author(s):  
Tara Houndt ◽  
Howard Ochman
Keyword(s):  
Antibiotic Resistance ◽  
Bacterial Species ◽  
Natural Populations ◽  
Enteric Bacteria ◽  
Commercial Application ◽  
Before And After ◽  
Resistance Patterns ◽  
High Level ◽  
Antibiotic Resistance Patterns ◽  
Level Resistance

ABSTRACT Several mechanisms are responsible for the ability of microorganisms to tolerate antibiotics, and the incidence of resistance to these compounds within bacterial species has increased since the commercial use of antibiotics became widespread. To establish the extent of and changes in the diversity of antibiotic resistance patterns in natural populations, we determined the MICs of five antibiotics for collections of enteric bacteria isolated from diverse hosts and geographic locations and during periods before and after commercial application of antibiotics began. All of the pre-antibiotic era strains were susceptible to high levels of these antibiotics, whereas 20% of strains from contemporary populations ofEscherichia coli and Salmonella entericadisplayed high-level resistance to at least one of the antibiotics. In addition to the increase in the frequency of high-level resistance, background levels, conferred by genes providing nonspecific low-level resistance to multiple antibiotics, were significantly higher among contemporary strains. Changes in the incidence and levels of antibiotic resistance are not confined to particular segments of the bacterial population and reflect responses to the increased exposure of bacteria to antimicrobial compounds over the past several decades.

scholarly journals Classification of Antibiotic Resistance Patterns of Indicator Bacteria by Discriminant Analysis: Use in Predicting the Source of Fecal Contamination in Subtropical Waters

2000 ◽  
Vol 66 (9) ◽  
pp. 3698-3704 ◽  
Author(s):  
Valerie J. Harwood ◽  
John Whitlock ◽  
Victoria Withington
Keyword(s):  
Antibiotic Resistance ◽  
Discriminant Analysis ◽  
Surface Waters ◽  
Fecal Coliform ◽  
Indicator Bacteria ◽  
Fecal Coliforms ◽  
Fecal Streptococci ◽  
Resistance Patterns ◽  
Antibiotic Resistance Patterns ◽  
Animal Feces

ABSTRACT The antibiotic resistance patterns of fecal streptococci and fecal coliforms isolated from domestic wastewater and animal feces were determined using a battery of antibiotics (amoxicillin, ampicillin, cephalothin, chlortetracycline, oxytetracycline, tetracycline, erythromycin, streptomycin, and vancomycin) at four concentrations each. The sources of animal feces included wild birds, cattle, chickens, dogs, pigs, and raccoons. Antibiotic resistance patterns of fecal streptococci and fecal coliforms from known sources were grouped into two separate databases, and discriminant analysis of these patterns was used to establish the relationship between the antibiotic resistance patterns and the bacterial source. The fecal streptococcus and fecal coliform databases classified isolates from known sources with similar accuracies. The average rate of correct classification for the fecal streptococcus database was 62.3%, and that for the fecal coliform database was 63.9%. The sources of fecal streptococci and fecal coliforms isolated from surface waters were identified by discriminant analysis of their antibiotic resistance patterns. Both databases identified the source of indicator bacteria isolated from surface waters directly impacted by septic tank discharges as human. At sample sites selected for relatively low anthropogenic impact, the dominant sources of indicator bacteria were identified as various animals. The antibiotic resistance analysis technique promises to be a useful tool in assessing sources of fecal contamination in subtropical waters, such as those in Florida.

scholarly journals Microbial Load and Antibiotic Resistance Patterns of Escherichia coli and Enterococcus faecalis Isolates from the Meat of Wild and Domestic Pigeons

Foods ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 536 ◽  
Author(s):  
Jorge Cordero ◽  
Carlos Alonso-Calleja ◽  
Camino García-Fernández ◽  
Rosa Capita
Keyword(s):  
Escherichia Coli ◽  
Antibiotic Resistance ◽  
Enterococcus Faecalis ◽  
Microbial Load ◽  
Fecal Coliforms ◽  
Resistant Bacteria ◽  
E Coli ◽  
Resistance Patterns ◽  
Antibiotic Resistance Patterns ◽  
Domestic Pigeons

An expansion in the consumption of pigeon meat has occurred in recent years. However, little is known about microbial load and antibiotic resistance of this foodstuff. The hygiene status and the antibiotic resistance patterns (disc diffusion; Clinical and Laboratory Standards Institute, CLSI) of Escherichia coli and Enterococcus faecalis isolates from wild and domestic pigeon carcasses were investigated. Average microbial loads (log10 cfu/cm2) ranged from 1.40 ± 1.17 (fecal coliforms) to 3.68 ± 1.40 (psychrotrophs). The highest (p < 0.05) microbial loads were observed in domestic pigeons. No substantial differences were found between isolates from domestic and wild pigeons with regard to the prevalence of antibiotic resistance. Of the E. coli strains, 20.00% were susceptible, 25.00% showed resistance or reduced susceptibility to one antimicrobial and 55.00% were multi-resistant. Among the E. faecalis isolates, 2.22% were susceptible and 97.78% were multi-resistant. The greatest prevalence of resistance or reduced susceptibility among E. coli was observed for amoxicillin-clavulanic acid (20.00% strains), ampicillin (26.67%), streptomycin (55.00%) and tobramycin (20.00%). The prevalence of resistance or reduced susceptibility among E. faecalis ranged from 31.11% (trimethoprim/sulfamethoxazole) to 97.78% (erythromycin). Meat from pigeons is a major reservoir of antibiotic-resistant bacteria. The need for the correct handling of this foodstuff in order to reduce risks to consumers is underlined.

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