scholarly journals Shigellosis and Development of Multiple Antimicrobial Resistance Mechanisms of Shigella spp.

2021 ◽  
Vol 18 (4) ◽  
pp. 703-718
Author(s):  
SK Tousif Ahamed ◽  
Nabanita Giri
Keyword(s):  
Efflux Pump ◽  
Shigella Flexneri ◽  
Resistance Mechanisms ◽  
Oral Route ◽  
Drug Binding ◽  
Shigella Dysenteriae ◽  
Public Health Issue ◽  
Shigella Boydii ◽  
Shigella Spp ◽  
Contaminated Food

Shigellosis is a serious public health issue. Millions of people suffer from this deadly food and water borne disease each year. The main manifestations of affected persons are bloody diarrhea with excessive dehydration. The causative agent of this disease is the bacteria Shigella spp. which has four serogroups. Though Shigella flexneri and Shigella dysenteriae are the dominant serogroups in developing countries, reports of other serogroups, namely Shigella boydii and Shigella sonnei, in the food contaminations are available. There are seasonal variations of Shigella infection throughout the world. In Asian subcontinent, monsoon and post monsoon times are the ideal for infection. The transmission of the bacteria in human is usually caused by feco-oral route or by contaminated food and water. There are several groups of antibiotics like foscomycin, macrolide, amiglycoside, tetracycline etc. which were used before. But they are now become useless as Shigella spp. is getting resistant against those drugs. The quinolone groups of antibiotics like ciprofloxacin, ofloxacin, norflxacin, ceftriaxone etc. are the important drugs for the cure of the disease shigellosis but prevalence of drug resistant strains of Shigella spp. against those drugs are a great concern nowadays. The occurrence of plasmid mediated quinolone resistance genes (PMQR), efflux pump proteins and effective mutations at drug binding region of gyrA etc. are the major mechanisms for the development of drug resistance.

Molecular Strategies for the Detection, Identification, and Differentiation between Enteroinvasive Escherichia coli and Shigella spp.

2005 ◽  
Vol 68 (2) ◽  
pp. 239-245 ◽  
Author(s):  
CESAR I. BIN KINGOMBE ◽  
MARIA-LUCIA CERQUEIRA-CAMPOS ◽  
JEFFREY M. FARBER
Keyword(s):  
Escherichia Coli ◽  
Multiplex Pcr ◽  
Shigella Flexneri ◽  
Shigella Dysenteriae ◽  
Shigella Boydii ◽  
Epidemiological Tool ◽  
Pcr Rflp ◽  
Shigella Spp

A strategy for the detection, identification, and differentiation of enteroinvasive Escherichia coli (EIEC) and Shigella spp. has been developed. The strategy includes (i) a multiplex PCR for the amplification of two virulence genes, i.e., iuc (222 bp) and ipaH (629 bp); (ii) amplification of the ial gene (a 1,038-bp amplicon) located within a large plasmid; and (iii) restriction fragment length polymorphism (RFLP) of the ial gene amplicon. The multiplex PCR provided three patterns. Pattern 1 (iuc−/ipaH+) was found in 10 (67%) of 15 EIEC strains tested, pattern 2 (iuc+/ipaH−) in only 2 (4.4%) of 46 non-EIEC isolates, whereas pattern 3 (iuc+/ipaH+) was observed in all Shigella spp. and also in 5 (33%) of 15 EIEC strains tested. The pattern 3 EIEC strains were all positive for the ial gene. The PCR-RFLP of the ial gene amplicon using the endonuclease AclI was used to differentiate Shigella spp. from the EIEC strains that belonged to pattern 3. The ial gene was present in 21 (38%) of 56 and 6 (40%) of 15 Shigella spp. and EIEC strains tested, respectively. The PCR-RFLP of the ial gene amplicon divided the strains in two types. Type 1 did not contain the restriction enzyme site and was found in 6 (100%) of 6 EIEC strains, 4 (80%) of 5 Shigella boydii, and 4 (100%) of 4 Shigella dysenteriae strains tested. Type 2, which gave two fragments of 286 and 752 bp, was observed in 5 (83%) of 6 Shigella flexneri strains and 6 (100%) of 6 Shigella sonnei strains. Detection, identification, and differentiation of Shigella spp. and EIEC were achieved by analyses of the PCR patterns and RFLP types. To our knowledge, this is the first study to demonstrate a simple and rapid method for detecting, identifying, and differentiating, at the molecular level, Shigella spp. and EIEC strains. This method will have tremendous utility as an epidemiological tool and in helping to develop policies, risk assessments, and national and international methods for Shigella spp.

Effect of bovine lactoferrin on the minimum inhibitory concentrations of ampicillin and trimethoprim–sulfamethoxazole for clinical Shigella spp. strains1This article is part of a Special Issue entitled Lactoferrin and has undergone the Journal’s usual peer review process.

2012 ◽  
Vol 90 (3) ◽  
pp. 412-416 ◽  
Author(s):  
Susan Mosquito ◽  
Gianina Zegarra ◽  
Claudia Villanueva ◽  
Joaquin Ruiz ◽  
Theresa J. Ochoa
Keyword(s):  
Peer Review Process ◽  
Shigella Flexneri ◽  
Shigella Dysenteriae ◽  
In Vivo Studies ◽  
Bovine Lactoferrin ◽  
Shigella Boydii ◽  
Microdilution Method ◽  
Shigella Spp ◽  
Resistant Strains

Here, we determined the effect of bovine lactoferrin (bLF) on the minimum inhibitory concentration (MIC) of ampicillin and trimethoprim–sulfamethoxazole in Shigella . Using a microdilution method, the MIC was determined in the presence or absence of bovine lactoferrin (10 mg/mL) on 88 Shigella strains (56 Shigella flexneri , 15 Shigella boydii , 13 Shigella sonnei , and 4 Shigella dysenteriae ) previously isolated from peruvian children <2 years old. A fold change of 2 or more in MIC values was considered significant. For ampicillin, 67 (76%) strains were highly resistant; one-third of the strains (32%) showed a decrease in ampicillin MIC in the presence of LF. This was more typical of MIC values in less resistant strains. For 7 (8%) ampicillin-resistant strains, the decrease in the MIC resulted in the strains reaching the cutoff for susceptible in the presence of bLF. For trimethoprim–sulfamethoxazole, 93% of the isolates (n = 82) were highly resistant and only 4 isolates (5%) decreased their MIC in the presence of bLF. None of the trimethoprim–sulfamethoxazole resistant strains became susceptible in the presence of LF. The decrease in the MIC in the presence of bLF seems to depend on the mechanisms of action of each antibiotic. In vivo studies are needed to further evaluate bLF as a coadjuvant to antibiotic treatment of resistant Shigella.

Quinoline resistance mechanisms in Plasmodium falciparum: the debate goes on

Parasitology ◽  
1997 ◽  
Vol 114 (7) ◽  
pp. 125-136 ◽  
Author(s):  
S. A. WARD ◽  
P. G. BRAY ◽  
S. R. HAWLEY
Keyword(s):  
Efflux Pump ◽  
Resistance Mechanism ◽  
Resistance Mechanisms ◽  
Food Vacuole ◽  
Drug Binding ◽  
Drug Uptake ◽  
Cross Resistance ◽  
Parasite Resistance ◽  
Therapeutic Success ◽  
Drug Binding Site

Despite considerable therapeutic success with the antimalarial 4-aminoquinolines such as chloroquine, there is serious doubt about the future of this drug class due mainly to the development and spread of parasite resistance throughout endemic areas. In this article we review the possible biochemical and molecular basis of resistance. Based on our current understanding we have considered the possibility of developing strategies which may allow the aminoquinolines to once again be used effectively against P. falciparum. Our conclusions are that drug resistance is the result of a reduced rate of drug uptake which in turn reduces the amount of drug available to bind the target. The basis for this reduced accumulation could be an altered pH gradient making the food vacuole more alkaline or the parasite cytosol more acidic, an efflux pump removing drug directly from the membrane or any other process which will reduce the rate of drug uptake. Central to the effectiveness of this resistance mechanism is the transient availability of a high affinity, low capacity drug binding site (possibly haem) within the parasite. Resistance reversers such as verapamil influence the apparent Ka for this drug binding phenomenon via an increased drug uptake rate. We demonstrate that by chemical modification of the aminoquinolines, producing predictable alterations in their physicochemical properties, that it is possible to minimise the verapamil sensitive component of resistance and reduce significantly cross-resistance patterns without loss in absolute activity. Based on these views we suggest that the aminoquinoline antimalarials still have a role to play in the cheap, safe and effective chemotherapy of falciparum malaria.

scholarly journals Molecular detection of all 34 distinct O-antigen forms of Shigella

2009 ◽  
Vol 58 (1) ◽  
pp. 69-81 ◽  
Author(s):  
Yayue Li ◽  
Boyang Cao ◽  
Bin Liu ◽  
Dan Liu ◽  
Qili Gao ◽  
...  
Keyword(s):  
Shigella Flexneri ◽  
Bacterial Species ◽  
Milk Powder ◽  
Shigella Dysenteriae ◽  
Detection Sensitivity ◽  
Clinical Samples ◽  
Shigella Boydii ◽  
O Antigen ◽  
Probe Concentration ◽  
O Antigens

Shigella is the cause of shigellosis or bacillary dysentery, the occurrence of which is estimated to be 165 million cases per year worldwide, resulting in 1.1 million deaths. Rapid and reliable assays for detecting and identifying Shigella in food, environmental and clinical samples are therefore necessary. Shigella species are traditionally identified by their O antigens. This study developed a DNA microarray targeting O-serotype-specific genes to detect all 34 distinct O-antigen forms of Shigella, including Shigella boydii types 1–18, Shigella dysenteriae types 1–13, Shigella flexneri types 1–5 and 6, and Shigella sonnei. A total of 282 strains were used to test the specificity of the microarray, including 186 Shigella and Escherichia coli representative strains, 86 Shigella clinical isolates and ten strains of other bacterial species that are commonly isolated from food or clinical stool specimens. The oligonucleotide probes were printed on the microarray in concentrations from 1 to 100 μM, and 10 μM proved to be the optimal probe concentration. The detection sensitivity for each serotype was 50 ng genomic DNA or 1 c.f.u. in 25 g milk powder sample following a 6 h enrichment in broth. The microarray is specific, sensitive and reproducible, and, to our knowledge, is the first report of a microarray for serotyping all O-antigen forms of Shigella.

scholarly journals Serotipos y susceptibilidad antimicrobiana de Shigella aisladas en un instituto de salud pediátrico de Lima, Perú entre enero y julio 2013

2014 ◽  
Vol 25 (2) ◽  
pp. 73
Author(s):  
Carlos Baca ◽  
Lisette Yupanqui ◽  
Jhan Canales ◽  
María Luz Zamudio ◽  
María del Carmen Quispe ◽  
...  
Keyword(s):  
Shigella Flexneri ◽  
Shigella Sonnei ◽  
Shigella Dysenteriae ◽  
Shigella Boydii

Objetivos: Determinar la frecuencia de serogrupos y serotipos y el perfil de susceptibilidad antimicrobiana de Shigella sp., aisladas en un instituto pediátrico de Lima, Perú. Material y métodos: Se evaluaron 85 aislamientos de Shigella sp., identificados bioquímicamente y serológicamente a nivel de serogrupo y serotipo por el método de aglutinación en lámina. Los patrones de resistencia antibiótica se determinaron mediante el método de disco difusión en agar. Resultados: De los 85 aislamientos de Shigella sp., 53 (62,3%) correspondieron al serogrupo B (Shigella flexneri), 28 (32,9%) al grupo D (Shigella sonnei) y 4 (4,8%) al grupo C (Shigella boydii), ningún aislamiento correspondió al grupo A (Shigella dysenteriae). Respecto a los serotipos, en el grupo B, fueron 46% 1b, 36% 2a y 18% variante Y; en el grupo C fue C4 y en el grupo D todos fueron Fase I. La evaluación del perfil de susceptibilidad mostró que el 100% de las cepas fueron sensibles a aztreonam, ácido nalidíxico y ciprofloxacina; entre 80 y 90% fueron resistentes a trimetoprim-sulfametoxazol, ampicilina y tetraciclina. Conclusiones: El serogrupo más frecuente fue Shigella flexneri, no se reportó Shigella dysenteriae. Existe elevado nivel de resistencia a Sulfametoxazole/trimetoprim, ampicilina y tetraciclina.

scholarly journals Bacterial enteropathogens causing acute diarrhoea in children in a tertiary care hospital, Imphal

2021 ◽  
Vol 8 (4) ◽  
pp. 2007
Author(s):  
Sarda Angom ◽  
Shan Damrolien ◽  
Tsering Wangmu ◽  
K. Mamta Devi ◽  
K. Sulochana Devi ◽  
...  
Keyword(s):  
Shigella Flexneri ◽  
Tertiary Care ◽  
Acute Diarrhoea ◽  
Cross Sectional Study ◽  
Care Hospital ◽  
Salmonella Spp ◽  
Cross Sectional ◽  
Shigella Boydii ◽  
Shigella Spp ◽  
Stool Samples

Background: Diarrhoeal diseases are responsible for causing 3 million deaths worldwide every year especially among the children and also the commonest cause of morbidity and mortality in developing countries like India. Infective diarrhoea could be either bacterial, viral, parasitic or occasionally a combination of these.Methods: A cross-sectional study was carried out in children below 12 years with acute diarrhoea in theMicrobiology Department, RIMS, Imphal for a period of 2 years. Stool samples were subjected to routine microbiological examination, followed by culture and sensitivity. Data were collected in a predesigned data collection sheet.Results: Majority of the diarrhoeal cases were seen among the age group of 1-3 years (44.3%), predominantly among the male children (66.2%) and mostly in summer. Out of 210 culture positive stool samples, Escherichia coli(83.3%) was the predominant enteropathogen with followed by Shigella spp.(12.9%), Klebsiella spp. (2.9%) and Salmonella spp. (1%). Serotyping revealed thirty five enteropathogenic E. coli, eighteen Shigella flexneri, seven Shigellasonnei, two Shigella boydii and two Salmonella typhimurium. Majority of the isolates showed high resistance to amoxicillin, ampicillin, ciprofloxacin, ofloxacin and cotrimoxazole.Conclusions: Bacterial enteropathogens are an important cause of acute diarrhoea among children. Rehydration therapy remains the initial treatment. Though it is usually self-limiting, empirical and specific antimicrobial therapy can be considered in certain situations. Awareness of improving hygiene and infectious diseases may help reduce the burden of infection.

scholarly journals Glimpse on shigellosis from endemic Bangladesh: decades of observation with urban-rural differentials

2016 ◽  
Vol 4 (2) ◽  
pp. 105-109
Author(s):  
Dipesh Kumar Barua ◽  
Sumon Kumar Das ◽  
Abu Syed Golam Faruque ◽  
Mohammad Habibur Rahman Sarker ◽  
Jui Das ◽  
...  
Keyword(s):  
Family Income ◽  
Economic Status ◽  
Shigella Flexneri ◽  
Diarrhoeal Disease ◽  
Protective Role ◽  
Shigella Sonnei ◽  
Shigella Dysenteriae ◽  
Moderate Increase ◽  
Shigella Boydii ◽  
Shigella Species

The Diarrhoeal Disease Surveillence System of icddr,b noted increasing proportion of Shigella sonnei and Shigella flexneri at urban Dhaka and rural Matlab from 2000 to 2013. Shigella sonnei appeared as emerging serogroup during 2009-13 compared to 2000-04 among individuals aged ? 60 years both in Dhaka and Matlab, while Shigella boydii and Shigella flexneri showed remarkable increase with 400% and 100% respectively in Dhaka, and a moderate increase (55%) both Shigella boydii and Shigella flexneri in Matlab. However, decreased trend of all the Shigella species in both the sites except Shigella dysenteriae in Dhaka was found among under-5 children. Individuals from higher socio-economic status such as those having a monthly family income of >100 USD had protective role against shigellosis in Dhaka during 2009-13. Shigella species and host factors are responsible for changing trend as well as predictors of shigellosis.Bangladesh Crit Care J September 2016; 4 (2): 105-109

scholarly journals SEROTYPING AND ANTIBIOTIC SENSITIVITY TESTING OF ENTEROBACTERIAL PATHOGENS IN DIARRHOEAL PATIENTS OF KATHMANDU

2003 ◽  
Vol 41 (143) ◽  
pp. 392-6
Author(s):  
Abhignya Subedi ◽  
C D Shrestha ◽  
R P Adhikari
Keyword(s):  
Public Health ◽  
Shigella Flexneri ◽  
Antibiotic Sensitivity ◽  
Shigella Dysenteriae ◽  
Salmonella Spp ◽  
Sensitivity Testing ◽  
E Coli ◽  
The Family ◽  
National Public Health ◽  
Shigella Spp

In a study carried out at National Public Health Laboratory, Teku, 236 samples werecollected from the diarrhoeal patients and half of them were The patients below 15years of age. Altogether 61 pathogens belonging to the family Enterobacteriaceaewere isolated. The presence of pathogens in the patterns below 5 years was highlysignificant (P<0.05%). E coli was most common (68.8%) followed by Salmonella spp.(16.4%) and Shigella spp. (14.7%). Enteropathogenic was E. coli was the most frequentisolate (71.4%) among the pathogenic E. coli. Similarly, Salmonella typhimuriumwas the commonest salmonellae and Shigella dysenteriae and Shigella flexneri werethe most commonly isolated shigellae. Most of the pathogens were sensitive toCiprofloxacin (72.1%) and least was sensitive to Ampicillin (9.8%). Only 4.9% of thepathogens were sensitive to all the antibiotics tested.

Salmonella and Shigella in Freshly Squeezed Orange Juice, Fresh Oranges, and Wiping Cloths Collected from Public Markets and Street Booths in Guadalajara, Mexico: Incidence and Comparison of Analytical Routes

2006 ◽  
Vol 69 (11) ◽  
pp. 2595-2599 ◽  
Author(s):  
A. CASTILLO ◽  
A. VILLARRUEL-LÓPEZ ◽  
V. NAVARRO-HIDALGO ◽  
N. E. MARTÍNEZ-GONZÁLEZ ◽  
M. R. TORRES-VITELA
Keyword(s):  
Orange Juice ◽  
Raw Materials ◽  
Shigella Flexneri ◽  
Food Service ◽  
Shigella Dysenteriae ◽  
Street Vendors ◽  
Public Markets ◽  
Shigella Boydii ◽  
Shigella Species ◽  
Plate Counts

A survey of the presence of Salmonella and Shigella in freshly squeezed orange juice and related samples was conducted in Guadalajara, Mexico. One hundred samples of freshly squeezed orange juice were collected from 49 street booths and 51 small food service establishments. In addition, 75 fresh orange samples, each consisting of five orange units, and 75 wiping cloths were collected from the same establishments from which juice had been collected. Salmonella was isolated from 14, 20, and 23% of samples of orange juice, orange surfaces, and wiping cloths collected from street vendors, while Shigella was isolated from 6, 17, and 5% of these samples. In general, the frequency of isolation of these pathogens in samples from juice serving establishments at public markets was significantly lower than that found among street vendors (P &lt; 0.05). Salmonella enterica serotypes Agona, Typhimurium, and Anatum were found in orange juice, fresh oranges, and wiping cloth samples, while serotype Mexico was found on fresh oranges and in wiping cloths and serotypes Muenchen and Panama were found only in wiping cloth samples. Regarding Shigella species, Shigella sonnei was found in all three types of sample tested; Shigella dysenteriae was found in juice and orange samples, Shigella boydii in orange and wiping cloth samples, and Shigella flexneri on oranges only. Thirty-one percent and 39% of the juice samples showed aerobic plate counts of ≥5.0 log CFU/ml and Escherichia coli counts of &gt;3.0 log CFU/ml, respectively. These high counts may indicate poor sanitation and potential exposure to fecal contamination either in the raw materials or during the orange-crushing and juice-serving process. These data may be useful for a further risk assessment of Salmonella or Shigella in unpasteurized, freshly squeezed juice.

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