esherichia coli
Recently Published Documents


TOTAL DOCUMENTS

168
(FIVE YEARS 48)

H-INDEX

18
(FIVE YEARS 3)

Author(s):  
M.M. Ananieva ◽  
Y.V. Chumak ◽  
G.A. Loban ◽  
M.O. Faustova

The problem of treatment and prevention of infectious-inflammatory post extraction complications in modern surgical dentistry are still challenging, despite the great advances in this field. Many etiological factors are identified as contributing to the development of such complications, but at present scientists are paying much attention to the infectious factor, which is associated with the microflora of the tooth socket after tooth removal. According to the literature, the most common post-extraction complication during an outpatient surgical appointment is alveolitis, which accounts for 1-35% of all cases of tooth extraction. To combat an infectious etiological factor of alveolitis, dental surgeons apply topical antiseptics with a broad spectrum of action such as iodoform and chlorhexidine. As a topical antiseptic drug in the treatment and prevention of oral infectious and inflammatory complications, a domestic antiseptic, Decasan, based on decamethoxine, is becoming more widely applied. Previous studies have shown that this antiseptic has antimicrobial effect against gram-positive and gram-negative, aerobic and anaerobic bacteria; this requires further in-depth studies of its properties, which could be applied in the dental surgical practice to treat and prevent infectious-inflammatory post extraction complications. Chlorhexidine bigluconate is a cationic biguanide. Penetrating into the intracellular membranes of bacteria, it impedes the oxygen consumption and leads to the death of bacterial cells. This antiseptic is widely used in dental practice. Treatment of alveolitis is carried out by using the standard method, namely by using iodoform tamponade of the tooth socket in combination with other medicines. Iodoform (triiodomethane) is a yellow crystalline substance with a strong characteristic odor, practically insoluble in water. In dentistry, this drug is used as an antiseptic in powder form, or combined pastes. The purpose of this in vitro study is to investigate the antimicrobial properties of Decasan, chlorhexidine and iodoform against museum microbial strains. Materials and methods. Museum strains of Staphylococcus aureus ATCC 25923, Staphylococcus epidermidis ATCC 14990, Enterococcus faecalis ATCC 29212, Esherichia coli ATCC 25922, Candida albicans ATCC 10231, obtained from L.V. Gromashevsky Institute of Epidemiology and Infectious Diseases, National Academy of Medical Sciences of Ukraine, were used as studied cultures of microorganisms. The antimicrobial effect of decasan, chlorhexidine and iodoform was assessed by quantitative method of serial dilutions in broth and agar according to the order №167, dated 5.04.2007 On approval of guidelines “Determination of sensitivity of microorganisms to antibacterial drugs". Conclusion. According to the data obtained, decasan and chlorhexidine demonstrate higher bacteriostatic and bactericidal effect on the studied museum microbial strains at a concentration thousands of times lower than the concentration of iodoform.


Foods ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 2793
Author(s):  
Athanasios Lattos ◽  
Ilias Chaligiannis ◽  
Dimitrios Papadopoulos ◽  
Ioannis A. Giantsis ◽  
Evanthia I. Petridou ◽  
...  

Raw-bivalves consumption is a wide trend in Mediterranean countries. Despite the unambiguous nutritional value of seafood, raw consumption of bivalves may involve risks that could pose a significant threat to consumers’ health. Their filter-feeding behavior is responsible for the potential hosting of a wide variety of microorganisms, either pathogenic for the bivalves or public health threats. Under this prism, the current study was conducted in an effort to evaluate the risk of eating raw bivalves originating from the two biggest seafood markets in Thessaloniki, the largest production area of bivalves in Greece. Both microbiological and molecular methodologies were applied in order to assess the presence of various harmful microbes, including noroviruses, Bonamia, Marteilia, Esherichia coli, Salmonella, and Vibrio. Results indicated the presence of several Vibrio strains in the analyzed samples, of which the halophilic Vibrio harveyi was verified by 16S rRNA sequencing; other than this, no enteropathogenic Vibrio spp. was detected. Furthermore, although Esherichia coli was detected in several samples, it was mostly below the European Union (EU) legislation thresholds. Interestingly, the non-target Photobacterium damselae was also detected, which is associated with both wound infections in human and aquatic animals. Regarding host pathogenic microorganisms, apart from Vibrio harveyi, the protozoan parasite Marteilia refrigens was identified in oysters, highlighting the continuous infection of this bivalve in Greece. In conclusion, bivalves can be generally characterized as a safe-to-eat raw food, hosting more bivalve pathogenic microbes than those of public health concern.


Author(s):  
М.М. Мадані

Мета дослідження – виявлення зв'язку та просте-ження закономірності між фітонцидною активністюдеревних рослин і вмістом зелених пігментів у їхніхлистках в урбанізованому середовищі. Методи. Комплексне використання польового, лабо-раторного, математично-статистичного, розрахунко-во-порівняльного методів і системного аналізу.Результати. Дуже висока антимікробна дія булавиявлена в листків A. platanoides, P. simonii та S. vulgarisщодо обох тест-культур на всіх моніторингових точкаху серпні. Для всіх видів характерний літній тип фітон-цидності. У досліджених видів виявлено тенденцію добільшої антимікробної активності щодо грам-негативноїбактерії E. coli порівняно з B. subtilis, окрім листків P. xcanadensis. На всіх ділянках, навіть у контролі, вмістхлорофілу а перевищував уміст хлорофілу b (табл. 2).На частку хлорофілу а припадає 50–56% від загальноїмаси зелених пігментів на забрудненій ділянці.Співвідношення хлорофілу a до хлорофілу b ( а/b)у нормально розвинутому фотосинтетичному апаратістановить 2,5–3. Навесні цей показник був нижчим занорму на всіх ділянках, влітку відбулося його збіль-шення, що можна пояснити ростом листків та форму-ванням фотосинтетичного апарату. На моніторинговійточці І влітку показник а/b був нижчим за норму в усіхвидів, окрім T. cordata.Висновки. Проведено аналіз фітонцидної актив-ності деревних культур в умовах урбанізованого сере-довища. Виявлено високу фітонцидну активність Acerplatanoides, Populus simonii та Syringa vulgaris у серпні.Встановлено специфічність антимікробної дії дерев-них рослин щодо Bacillus subtilis та Esherichia coli. Назабрудненій ділянці вздовж автомагістралі спостеріга-лося зниження суми хлорофілів порівняно з контролемта зростання фітонцидної активності. Вміст хлорофілуа на І дослідній ділянці в усіх досліджених рослин,окрім Tilia cordata, перевищив уміст хлорофілу b. Длябільшості видів характерна висока антимікробна актив-ність протягом досліджуваного періоду, крім Robiniapseudoacacia та Tilia cordata.


2021 ◽  
Vol 18 (3) ◽  
pp. 8-18
Author(s):  
S. A. Hassan ◽  
B. V. Maikai ◽  
J. Kabir ◽  
M. B. Aliyu

Maintenance of strict biosecurity measures is essential in preventing disease spread from Live Bird Markets (LBMs) which serve as a major intermingling area for poultry from different sources. This study assessed the Biosecurity measures and spatial distribution of daily Live Bird Markets of four North-western States in Nigeria. Closed ended questionnaires were administered in 35 daily LBMs in Kaduna, Kano, Katsina and Zamfara states and identification of disinfectants used in the LBMs were noted. Swab samples of birds’ cages in the LBMs were taken for E. coli isolation. The live bird managers and marketers were all male (100%) across all the four states. Only 6(17%) out of the 35 LBMs had high biosecurity level, 69% had a moderate biosecurity level and 5(14%) were graded as low. Of the 400 Live bird marketers administered questionnaires, only 71 (18%) employ good biosecurity practices and 305(76%) were graded as fair and remaining 24(6%) as poor. Majority of the LBMs were located within human settlements without any form of barrier. There were seven main types of disinfectants identified across the all LBMs. Esherichia coli was isolated from 1(17%) LBM among the 6(17%) LBMs that were identified to have and use disinfectant. From the remaining 29(83%) LBMs, E.coli was isolated from only 5(17%) despite lacking in use of disinfectant by these LBMs. Live bird marketers should be educated on the need to adhere to biosecurity measures and practices.


2021 ◽  
Vol 31 (3) ◽  
pp. 273-276
Author(s):  
Ilya Petrov ◽  
◽  
Igor Vysekantsev ◽  
Yana Cherkashina ◽  
Olena Peretyatko ◽  
...  

Plants ◽  
2021 ◽  
Vol 10 (9) ◽  
pp. 1833
Author(s):  
Rodica Beicu ◽  
Ersilia Alexa ◽  
Diana Obiștioiu ◽  
Ileana Cocan ◽  
Florin Imbrea ◽  
...  

The purpose of this study was to analyze the chemical composition and antimicrobial activity of some thymus populations collected from five different locations in Western Romania. The chemical compositions of the essential oils (EOs) were studied through GC–MS, and the biological activities were evaluated using the microdilution method. The EO yield ranged between 0.44% and 0.81%. Overall, 60 chemical compounds were identified belonging to three chemotypes: thymol (three populations), geraniol (one population) and carvacrol (one population). Thymus vulgaris L. is distinguished by a high content of thymol, while species of spontaneous flora (Th. odoratissimus and Th. pulegioides) contain, in addition to thymol, appreciable amounts of carvacrol and geraniol. The antimicrobial activity of each the five oils was tested on Staphylococcus aureus (ATCC 25923), Streptococcus pyogenes (ATCC 19615), Esherichia coli (ATCC 25922), Pseudomonas aeruginosa (ATCC 27853), Shigella flexneri (ATCC 12022), Salmonella typhimurium (ATCC 14028), Haemophilus influenzae type B (ATCC 10211), Candida albicans (ATCC 10231) and Candida parapsilopsis (ATCC 22019). The EOs showed biological activity on Gram-positive/Gram-negative/fungal pathogens, the most sensitive strains proving to be S. pyogenes, S. flexneri, S. typhimurium and C. parapsilopsis with an MIC starting at 2 µL EO/100 µL. The species sensitive to the action of Thymus sp. from culture or spontaneous flora are generally the same, but it should be noted that T. odoratissimus has a positive inhibition rate higher than other investigated EOs, regardless of the administered oil concentration. To date, there is no research work presenting the chemical and antimicrobial profiling of T. odoratissimus and the correlations between the antimicrobial potential and chemical composition of wild and cultivated populations of thyme (Thymus sp.) growing in Western Romania.


2021 ◽  
pp. 163-172
Author(s):  
Eldar Abdulla Garaev ◽  
Adila Karam Valiyeva ◽  
Amalia Nazim Karamli ◽  
Nigar Mustafa Huseynova

The purpose of the investigation is to study non-alkaloidal biological active compounds of various organs, the antimicrobial activity of plant oil and ethanolic extracts of Datura innoxia Mill. from nightshades (Solanaceae). D. innoxia grows in the natural environmental conditions of the Republic of Azerbaijan. We have studied presence of several biological active compounds – triterpenoic acids, essential oils, fatty acids, sterols and amino acids in the content of various organs of plant. Oil was obtained by using Soxhlet apparatus and investigated by GC method. After removing the oil from the seeds, triterpenoic acids - oleanolic and ursolic acids were isolated and identified by TLC. Essential oils were obtained from plant leaves by hydrodistillation and studied by GC-MS method. 20 amino acids were identified in the aerial part of the plant by the HPLC method, with amino acid analyzer L-8800 (Hitachi, Ltd.), 12 of them are non-essential, 8 are essential. The antimicrobial activity of plant oils of seed and ethanolic extracts of some parts (roots, stems, leaves, flowers, fruits and seeds) were studied on Staphylococcus aureus, Esherichia coli, Pseudomonas aeruginosa, Bacillus anthracoides, Klebsiella pneumoniae and Candida albicans. The significant activity of some extracts (stems, leaves, fruits and seeds) was observed against S. aureus, E. coli, C. albicans, B. anthracoides and plant oil against C. albicans.


2021 ◽  
Vol 10 (1) ◽  
pp. 7-11
Author(s):  
Eko Naning Sofyanita ◽  
Roni Afriansya

Honey and cinnamon are plant products that have many properties, one of which is used as an antibacterial agent for various diseases. The effectiveness of the two active substances against bacteria in the Enterobacteriaeae family is unclear. The study was conducted to determine the differences in the effectiveness of forest honey and cinnamon in inhibiting the growth of bacteria in the Enterobacteriaceae family. This research method is an experimental study with a combination method of diffusion and wells using samples of the bacteria Klebsiella pneumoniae, Esherichia coli, Salmonella typhi, Serratia marcescens, and Enterobacter cloacae. Forest pure honey and cinnamon were prepared as test solutions with concentrations of 25%, 40%, 55%, 70%, 85% and 100%. The results obtained were the inhibition zone formed on Nutrient Agar Plate (NAP) media, in forest pure honey the inhibition zone formed in S. typhi, E. coli, Klebsiella pneumoniae, Serratia marcescens, and Enterobacter cloacae was greater at 100% concentration, namely 30.5mm, 32.5mm, 38mm, 29.5mm, 26mm, while the 100% concentration of cinnamon showed results, namely 12mm, 10mm, 8.5mm, 11mm, and 11mm. Conclusion is Forest pure honey was more effective at inhibiting bacteria from the Enterobacteriaceae family than cinnamon.


2021 ◽  
Author(s):  
Ilknur Erdem ◽  
Ilker Yildirim ◽  
Birol Safak ◽  
Ritvan Karaali ◽  
Berna Erdal ◽  
...  

Abstract OBJECTIVE: ‘Nosocomial infections’ or ‘healthcare associated infections’ are a significant public health problem around the world. This study aimed to assess the rate of culture confirmed nosocomial infections (NIs), frequency of nosocomial pathogens and the antimicrobial resistance patterns of bacterial isolates in a University Hospital. METHODS: A retrospective evaluation of NIs in a tertiary hospital, between the years 2015 and 2019 in Tekirdag, Turkey. RESULTS : During the five years, the overall incidence rates (NI/100) and incidence densities (NI/1000 days of stay) of NIs were 2.04% (range 1.76-2.41/100) and 3.50/1000 patients-days (range 2.85-4.64/1000), respectively. 57.4 % of the infections were originated from the Intensive Care Units. The most common NIs according to the primary sites were bloodstream infections (55.3 %) and, pneumonia (20.4%). 67.5% of the isolated microorganisms as nosocomial agents were Gram negative bacteria, 24.9% of Gram positive bacteria and 7.6 % of candida. The most frequently isolated causative agents were Esherichia coli (16.7%) and Pseudomonas aeruginosa (15.7%). The rate of extended spectrum beta-lactamase production among E. coli isolates was 51.1%. Carbapenem resistance was 29.8% among isolates of Pseudomonas aeruginosa; 95.1% among isolates of Acinetobacter baumannii, 18.2% among isolates of Klebsiella pneumoniae. Colistin resistance was 2.4% among isolates of Acinetobacter baumannii. Vancomycin resistance was 5.3% among isolates of Enterococci.CONCLUSION: Our study results demonstrates the microorganisms of isolated from Intensive Care Units demonstrates high level resistance to many antimicrobial agents. The rising in incidence of multidrug-resistant microorganisms indicate that more interventions are urgently needed to reduce NIs in our ICUs.


Sign in / Sign up

Export Citation Format

Share Document