scholarly journals THE PREVALENCE OF MORAXELLA BOVIS IN CLINICALLY NORMAL CATILE EYES: ITS SIGNIFICANCE TO INFECTIOUS BOVINE KERATO-CONJUNCTIVITIS

2021 ◽  
Vol 18 ◽  
pp. 74-77
Author(s):  
G. O. EGWU ◽  
L. T. ZARIA ◽  
N. L. IMAN
Keyword(s):  
Escherichia Coli ◽  
Bacterial Species ◽  
The Other ◽  
Aetiological Agent ◽  
Adult Cattle ◽  
Clinically Normal ◽  
Moraxella Bovis ◽  
Young Cattle ◽  
Branhamella Catarrhalis

In a study to determine the prevalence of Moraxella bovis in clinically normal cattles eyes in the Maiduguri area of Nigeria, 35 adult cattle (70 eyes) and 25 calves (50 eyes) were sampled. Three each of the adult and young cattle making a total of 6 (5%) were positive for M.bovis (the aetiological agent of infections bovine Keratoconjunctivitis) out of the 120 eyes sampled. Branhamella catarrhalis, Branhamella mucosa and Escherichia coli were each isolated respectively, from 2 (1.6%) of the 120 samples. The other bacterial species isolated were Bacillus (5:4.2%), Corynebacterium (17; 14.2%), Streptococcus (9; 7.7%) and Staphylococcus (21/17.5%), could be regarded as commensals. The epidemiological implications of finding M. bovis in clinically normal cattle eyes are discussed. 

scholarly journals Research on reproductive performance of mares in Serbia using bacteriological examination

2011 ◽  
Vol 27 (3) ◽  
pp. 883-892
Author(s):  
M.I. Urosevic ◽  
D. Stojanovic ◽  
B. Lako ◽  
I. Jajic ◽  
Z. Milicic ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Reproductive Performance ◽  
Staphylococcus Epidermidis ◽  
Pasteurella Multocida ◽  
Bacterial Species ◽  
The Other ◽  
Streptococcus Zooepidemicus ◽  
Bacteriological Examination ◽  
Reproductive Disorders ◽  
Bacillus Spp

The research was conducted on 19 stud farms in Serbia, on 80 mares used for breeding, with and without reproductive disorders. During the two years period (from 2009 to 2010) double guarded uterine swabs from 80 mares, aged between 3 and 22 years were collected. Mares belonged to the different breeds: Thoroughbred, Standardbred, Lipizzaner and mixed breeds. It was determined, that bacterial infection of genital organs was found in 24 mares in the examined population, and the bacterial species Streptococcus zooepidemicus was diagnosed in the 11 samples from cervical swabs. In the 5 samples, Escherichia coli was isolated, while Staphylococcus epidermidis and Pasteurella multocida were present in the 2 samples each, while the other causes and simultaneous isolation of two bacterial species are much less present. These species are: Bacillus spp. plus Escherichia coli; Streptococcus zooepidemicus plus Klebsiella pneumoniae and Escherichia coli plus Streptococcus zooepidemicus. In one swab we determinated Arcanobacter pyogenes. In this examination, according to available data after natural mating, we found conception level of 43,10%, which is similar with previous reports in our country.

scholarly journals Single-Nucleotide Polymorphism Phylotyping of Escherichia coli

2005 ◽  
Vol 71 (8) ◽  
pp. 4784-4792 ◽  
Author(s):  
Florence Hommais ◽  
Sabrina Pereira ◽  
Cécile Acquaviva ◽  
Patricia Escobar-Páramo ◽  
Erick Denamur
Keyword(s):  
Escherichia Coli ◽  
Bacterial Species ◽  
Bacterial Genome ◽  
The Other ◽  
Enzyme Electrophoresis ◽  
Phylogenetic Groups ◽  
Single Nucleotide ◽  
E Coli ◽  
Base Extension ◽  
Typing Methods

ABSTRACT We describe a rapid and easily automated phylogenetic grouping technique based on analysis of bacterial genome single-nucleotide polymorphisms (SNPs). We selected 13 SNPs derived from a complete sequence analysis of 11 essential genes previously used for multilocus sequence typing (MLST) of 30 Escherichia coli strains representing the genetic diversity of the species. The 13 SNPs were localized in five genes, trpA, trpB, putP, icdA, and polB, and were selected to allow recovery of the main phylogenetic groups (groups A, B1, E, D, and B2) and subgroups of the species. In the first step, we validated the SNP approach in silico by extracting SNP data from the complete sequences of the five genes for a panel of 65 pathogenic strains belonging to different E. coli pathovars, which were previously analyzed by MLST. In the second step, we determined these SNPs by dideoxy single-base extension of unlabeled oligonucleotide primers for a collection of 183 commensal and extraintestinal clinical E. coli isolates and compared the SNP phylotyping method to previous well-established typing methods. This SNP phylotyping method proved to be consistent with the other methods for assigning phylogenetic groups to the different E. coli strains. In contrast to the other typing methods, such as multilocus enzyme electrophoresis, ribotyping, or PCR phylotyping using the presence/absence of three genomic DNA fragments, the SNP typing method described here is derived from a solid phylogenetic analysis, and the results obtained by this method are more meaningful. Our results indicate that similar approaches may be used for a wide variety of bacterial species.

scholarly journals An extended model for transfer of micro-organisms via the hands: differences between organisms and the effect of alcohol disinfection

1984 ◽  
Vol 92 (3) ◽  
pp. 345-355 ◽  
Author(s):  
C. A. Mackintosh ◽  
P. N. Hoffman
Keyword(s):  
Escherichia Coli ◽  
Streptococcus Pyogenes ◽  
Contact Time ◽  
Bacterial Species ◽  
The Other ◽  
Transfer Model ◽  
Extended Model ◽  
Klebsiella Aerogenes ◽  
Fold Reduction ◽  
Micro Organisms

SummaryA model for contact transfer of micro-organisms by hand has been extended to include representatives of bacterial species responsible for a majority of hospitalacquired infections. The ability of the organisms to transfer from contaminated fabrics to hands and from hands to sterile fabrics was measured, as was their ability to survive on the skin of the hands. There were differences between the species. Staphylococcus saprophyticus transferred well to the hand but not as well from hand to fabric as the other species; it survived well on skin. Pseudomonas aeruginosa, Klebsiella aerogenes and Serratia marcescens transferred moderately well overall and also survived on the skin. These results were in contrast to those obtained with a strain of Escherichia coli and one of Streptococcus pyogenes.The contact transfer model was used to investigate the use of small volumes of alcohol in preventing transfer via the hands. An alcohol handrub of either 0·3 ml 80% ethanol or 0·3 ml 70% isopropanol gave reductions in transfer slightly less than that of a soap and water wash. Raising the volume, and consequently the contact time, to 0·5 ml 70% isopropanol gave a 14000-fold reduction in transfer, statistically indistinguishable from that of a thorough soap and water wash (9800-fold reduction).

scholarly journals Frequency of Different Bacterial Species and their Antibiogram among Patients with Chronic Otitis Media

2021 ◽  
pp. 215-220
Author(s):  
Mohammad Farooq Bhutta ◽  
Ashfaq Hussain ◽  
Salman Baig ◽  
Asad Ullah ◽  
Sarwath Fatimee ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Otitis Media ◽  
Antimicrobial Susceptibility ◽  
Proteus Mirabilis ◽  
Bacterial Species ◽  
Chronic Otitis Media ◽  
The Other ◽  
Suppurative Otitis Media

Aim: To find out the frequency of different bacterial species and their antibiogram among the patients of chronic suppurative otitis media. Study Design: Descriptivecross-sectional. Place and Duration of Study: The study was conducted at the ENT department of Bahawal Victoria hospital between July to December 2020. Methodology: About 50 patients presented with unilateral or bilateral ear discharge and diagnosed as a case of chronic suppurative otitis media were included in the study. The disk diffusion method was used on Mueller-Hinton Agar to detect antimicrobial susceptibility. Multipledrugs were tested for checking antimicrobial susceptibility. The data were analyzed by using Statistical Package for the Social Sciences (SPSS) version 20. Results: The mean age of the study participants was 13.89 ± 12.37 years. The majority of participants were froma younger age group i.e. less than10 years of age with female predominance. It had been found that the majority of cases (51%) were having Staphylococcus aureus infestation followed by Pseudomonas aeruginosa, Escherichia coli and very few with Proteus mirabilis. On the other hand, multiple drugs were tested to find out the antimicrobial susceptibility among the cases of chronic otitis media and the results reported that all the bacterial species were susceptible to Ceftriaxone while the other antibiotics were havinga variable response for different strains of bacteria. Conclusion: Results concluded that the Staphylococcus aureus was the most common organism followed by Pseudomonas aeruginosa, Escherichia coli and very few with Proteus mirabilis. It is important to identify the pathogenic organism and its sensitivity pattern before prescribing any antibiotic.

Infection of Escherichia coli with bacteriophages

1969 ◽  
Vol 27 ◽  
pp. 370-371
Author(s):  
Manfred E. Bayer
Keyword(s):  
Escherichia Coli ◽  
Nucleic Acid ◽  
Cell Surface ◽  
Virus Type ◽  
Infection Process ◽  
Adsorption Site ◽  
The Other ◽  
Specific Receptors ◽  
Bacterial Receptors

The first step in the infection of a bacterium by a virus consists of a collision between cell and bacteriophage. The presence of virus-specific receptors on the cell surface will trigger a number of events leading eventually to release of the phage nucleic acid. The execution of the various "steps" in the infection process varies from one virus-type to the other, depending on the anatomy of the virus. Small viruses like ØX 174 and MS2 adsorb directly with their capsid to the bacterial receptors, while other phages possess attachment organelles of varying complexity. In bacteriophages T3 (Fig. 1) and T7 the small conical processes of their heads point toward the adsorption site; a welldefined baseplate is attached to the head of P22; heads without baseplates are not infective.

The Nature of the Intramembrane Particle

1980 ◽  
Vol 38 ◽  
pp. 688-691
Author(s):  
A.J. Verkleij
Keyword(s):  
Escherichia Coli ◽  
Tight Junction ◽  
Gap Junction ◽  
The Other ◽  
Fracture Face ◽  
Band 3 Protein ◽  
Satisfactory Explanation ◽  
Freeze Fracturing ◽  
Intramembrane Particle ◽  
Luminal Membrane

Freeze-fracturing splits membranes into two helves, thus allowing an examination of the membrane interior. The 5-10 rm particles visible on both monolayers are widely assumed to be proteinaceous in nature. Most membranes do not reveal impressions complementary to particles on the opposite fracture face, if the membranes are fractured under conditions without etching. Even if it is considered that shadowing, contamination or fracturing itself might obscure complementary pits', there is no satisfactory explanation why under similar physical circimstances matching halves of other membranes can be visualized. A prominent example of uncomplementarity is found in the erythrocyte manbrane. It is wall established that band 3 protein and possibly glycophorin represents these nonccmplanentary particles. On the other hand a number of membrane types show pits opposite the particles. Scme well known examples are the ";gap junction',"; tight junction, the luminal membrane of the bladder epithelial cells and the outer membrane of Escherichia coli.

scholarly journals Lac Operon Boolean Models: Dynamical Robustness and Alternative Improvements

Mathematics ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 600 ◽  
Author(s):  
Marco Montalva-Medel ◽  
Thomas Ledger ◽  
Gonzalo A. Ruz ◽  
Eric Goles
Keyword(s):  
Escherichia Coli ◽  
Limit Cycles ◽  
The Other ◽  
Lac Operon ◽  
Boolean Models ◽  
Bistable Behavior

In Veliz-Cuba and Stigler 2011, Boolean models were proposed for the lac operon in Escherichia coli capable of reproducing the operon being OFF, ON and bistable for three (low, medium and high) and two (low and high) parameters, representing the concentration ranges of lactose and glucose, respectively. Of these 6 possible combinations of parameters, 5 produce results that match with the biological experiments of Ozbudak et al., 2004. In the remaining one, the models predict the operon being OFF while biological experiments show a bistable behavior. In this paper, we first explore the robustness of two such models in the sense of how much its attractors change against any deterministic update schedule. We prove mathematically that, in cases where there is no bistability, all the dynamics in both models lack limit cycles while, when bistability appears, one model presents 30% of its dynamics with limit cycles while the other only 23%. Secondly, we propose two alternative improvements consisting of biologically supported modifications; one in which both models match with Ozbudak et al., 2004 in all 6 combinations of parameters and, the other one, where we increase the number of parameters to 9, matching in all these cases with the biological experiments of Ozbudak et al., 2004.

scholarly journals An Understanding of the Global Status of Major Bacterial Pathogens of Milk Concerning Bovine Mastitis: A Systematic Review and Meta-Analysis (Scientometrics)

Pathogens ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 545
Author(s):  
Paramanandham Krishnamoorthy ◽  
Kuralayanapalya P. Suresh ◽  
Kavitha S. Jayamma ◽  
Bibek R. Shome ◽  
Sharanagouda S. Patil ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Management Practices ◽  
Meta Analysis ◽  
Bacterial Species ◽  
Clinical Mastitis ◽  
Therapeutic Interventions ◽  
Coagulase Negative Staphylococcus ◽  
Prevalence Studies ◽  
The World ◽  
Pathogen Prevalence

In this study, the major mastitis pathogen prevalence in the cattle and buffalo of the world was estimated by a meta-analysis. Staphylococcus (S) species, Streptococcus (St) species, and Escherichia coli (Ec) prevalence studies reported during 1979–2019 were collected using online databases, and offline resources. A meta-analysis of these data was done with the meta package in R-Software. The Staphylococcus aureus was the major mastitis pathogen, mostly causing subclinical mastitis, Ec causing clinical mastitis and St causing subclinical and clinical mastitis. The pooled prevalence estimates of S, St, and Ec were 28%, 12%, and 11% in the world from 156, 129, and 92 studies, respectively. The S, St, and Ec prevalences were high in Latin America (51%), Oceania (25%), and Oceania (28%), respectively. Higher S, St, and Ec prevalences were observed by molecular methods, signifying high sensitivity and usefulness for future studies. Among bacterial species, S. aureus (25%) followed by coagulase-negative Staphylococcus species (20%), Escherichia coli (11%), St. agalactiae (9%), St. uberis (9%) were the important pathogens present in the milk of the world. We hypothesize that there is a urgent need to reduce mastitis pathogen prevalence by ensuring scientific farm management practices, proper feeding, therapeutic interventions to augment profits in dairying, and improving animal and human health.

scholarly journals Development of a Genoserotyping Method for Salmonella Infantis Detection on the Basis of Pangenome Analysis

2020 ◽  
Vol 9 (1) ◽  
pp. 67
Author(s):  
Seung-Min Yang ◽  
Jiwon Baek ◽  
Eiseul Kim ◽  
Hyeon-Be Kim ◽  
Seyoung Ko ◽  
...  
Keyword(s):  
Public Health ◽  
Polymerase Chain Reaction ◽  
Bacterial Species ◽  
Cost Effective ◽  
The Other ◽  
Gene Marker ◽  
Diagnostic Assay ◽  
Chain Reaction ◽  
Polymerase Chain ◽  
Substantial Economic Burden

In recent years, Salmonella Infantis has become a predominant serovariant in clinical and poultry isolates, thereby imposing a substantial economic burden on both public health and the livestock industry. With the aim of coping with the steep increase in serovar Infantis prevalence, a polymerase chain reaction (PCR)-based rapid and accurate diagnostic assay was developed in this study through pangenome profiling of 60 Salmonella serovars. A gene marker, SIN_02055, was identified, which is present in the S. Infantis genome but not in the pangenome of the other serovars. Primers specific to SIN_02055 were used to accurately detect serovar Infantis, and to successfully differentiate Infantis from the other 59 serovars in real-time PCR with a R2 of 0.999 and an efficiency of 95.76%. The developed method was applied to 54 Salmonella strains belonging to eight dominant serovars, and distinguished Infantis from the other seven serovars with an accuracy of 100%. The diagnostic primer set also did not show false positive amplification with 32 strains from eight non-Salmonella bacterial species. This cost-effective and rapid method can be considered an alternative to the classic serotyping using antisera.

scholarly journals Characterization of Escherichia coli Strains Derived from Cow Milk of Subclinical and Clinical Cases of Mastitis

2021 ◽  
Vol 11 (2) ◽  
pp. 541
Author(s):  
Katarzyna Grudlewska-Buda ◽  
Krzysztof Skowron ◽  
Ewa Wałecka-Zacharska ◽  
Natalia Wiktorczyk-Kapischke ◽  
Jarosław Bystroń ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Bacterial Species ◽  
Subclinical Mastitis ◽  
Clinical Mastitis ◽  
Economic Problem ◽  
Cow Milk ◽  
P Value ◽  
Dairy Herds ◽  
E Coli ◽  
Bonferroni Test

Mastitis is a major economic problem in dairy herds, as it might decrease fertility, and negatively affect milk quality and milk yield. Out of over 150 bacterial species responsible for the udder inflammation, Escherichia coli is one of the most notable. This study aimed to assess antimicrobial susceptibility, resistance to dipping agents and biofilm formation of 150 E. coli strains isolated from milk of cows with subclinical and clinical mastitis. The strains came from three dairy herds located in Northern and Central Poland. The statistical analyses were performed with post-hoc Bonferroni test and chi-square test (including Yates correction). The data with a p value of <0.05 were considered significant. We found that the tested strains were mostly sensitive to antimicrobials and dipping agents. It was shown that 37.33% and 4.67% of strains were resistant and moderately resistant to at least one antimicrobial agent, respectively. No extended-spectrum beta-lactamases (ESBL)-producing E. coli were detected. The majority of strains did not possess the ability to form biofilm or formed a weak biofilm. The strong biofilm formers were found only among strains derived from cows with subclinical mastitis. The lowest bacteria number was noted for subclinical mastitis cows’ strains, after stabilization with iodine (3.77 log CFU × cm−2) and chlorhexidine (3.96 log CFU × cm−2) treatment. In the present study, no statistically significant differences in susceptibility to antibiotics and the ability to form biofilm were found among the strains isolated from cows with subclinical and clinical mastitis. Despite this, infections in dairy herds should be monitored. Limiting the spread of bacteria and characterizing the most common etiological factors would allow proper treatment.

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