Bacteremia por Vibrio cholerae NO-O1/NO-O139 en un paciente cirrótico: Primer reporte de caso en el Perú y revisión de la literatura / Vibrio cholerae NO-O1/NO-O139 bacteremia in a cirrhotic patient: First case report in Peru and literatura review

Vibrio cholerae serogrupo NO-O1/NO-O139 (VCNO) es causa infrecuente de gastroenteritis. Sin embargo, se le asocia a infección extra-intestinal severa en huéspedes inmunocomprometidos, y entre ellas, la bacteremia en pacientes con cirrosis hepática es digna de mención. A continuación, presentamos el caso de una mujer de 58 años, con el diagnóstico de cirrosis hepática de fondo, que desarrolló progresivamente choque séptico, disfunción orgánica múltiple y desenlace fatal al cuarto día de su admisión. Los resultados obtenidos post mortem, de los hemocultivos previamente tomados, aislaron bacilos gram negativos compatibles con Vibrio cholerae. Posteriormente, se identificó el serogrupo NO-O1/NO-O139, a través de aglutinación en placa y PCR negativo para el gen ctxA. El antibiograma mostró susceptibilidad conservada a ampicilina, cloranfenicol, tetraciclina y ciprofloxacino, con resistencia al trimetoprim-sulfametoxazol. El presente caso, descrito en el Hospital Nacional Dos de Mayo, es hasta la fecha, el primer reporte de bacteremia VCNO en el Perú.

Non-O1, non-O139 Vibrio cholerae (NOVC) strains are an uncommon cause of gastroenteritis. However, they have been recently associated with severe extraintestinal infections in immunocompromised hosts. Among them, bacteremia in cirrhotic patients is noteworthy. We present the case of a 58-year-old woman with cirrhosis that developed septic shock, multiple organ failure and died four days after admission. Blood cultures yielded Gram-negative rods identified as Vibrio cholerae. Further serogrouping by slide agglutination and a negative PCR for ctxA gen confirmed the strain to be NOVC. Antimicrobial susceptibility testing showed sensitivity to ampicillin, chloramphenicol, tetracycline and ciprofloxacin; and resistance to trimethoprim-sulfamethoxazole. To the best of our knowledge, this is first report in Peru, described in the Hospital Nacional Dos de Mayo, of NOVC bacteremia.

In Silico Structural and Functional Annotation of Hypothetical Proteins of Vibrio cholerae O139

In developing countries threat of cholera is a significant health concern whenever water purification and sewage disposal systems are inadequate. Vibrio cholerae is one of the responsible bacteria involved in cholera disease. The complete genome sequence of V. cholerae deciphers the presence of various genes and hypothetical proteins whose function are not yet understood. Hence analyzing and annotating the structure and function of hypothetical proteins is important for understanding the V. cholerae. V. cholerae O139 is the most common and pathogenic bacterial strain among various V. cholerae strains. In this study sequence of six hypothetical proteins of V. cholerae O139 has been annotated from NCBI. Various computational tools and databases have been used to determine domain family, protein-protein interaction, solubility of protein, ligand binding sites etc. The three dimensional structure of two proteins were modeled and their ligand binding sites were identified. We have found domains and families of only one protein. The analysis revealed that these proteins might have antibiotic resistance activity, DNA breaking-rejoining activity, integrase enzyme activity, restriction endonuclease, etc. Structural prediction of these proteins and detection of binding sites from this study would indicate a potential target aiding docking studies for therapeutic designing against cholera.

Molecular characteristics and antibiotic resistance of Vibrio cholerae O139 in Shandong province / 中华预防医学杂志

<p><b>OBJECTIVE</b>To investigate the molecular epidemiological characteristics and antibiotic resistance profiles of Vibrio cholerae O139 in Shandong province.</p><p><b>METHODS</b>A total of 13 strains of V. cholerae O139 (9 clinical strains and 4 environmental strains) isolated from cholera epidemics in Shandong province since 1997 were recovered and confirmed with serum agglutination and biochemical reaction. Pulsed-field gel electrophoresis (PFGE) was carried out for molecular subtyping. Virulence genes and drug resistance related genes were detected by PCR. Antibiotic susceptibility tests were performed using micro-broth dilution method.</p><p><b>RESULTS</b>Thirteen strains of V. cholerae O139 were differentiated into seven pulsetypes. One clinical strain and two environmental strains isolated from Jining in 2013 were clustered into the pulsetype namely KZGN11O139. CN0077, and an identical PFGE pattern of KZGN11O139. CN0002 was found among three clinical strains from Jinan in 2005, Jining in 2005 and Heze in 2009. Other pulsotypes were unique in China and found only in Shandong province. Because of deletion of ctxAB and tcpI, the PFGE patterns of two strains isolated from Yantai in 2000 and 2004 were different from other 11 strains which harbored ctxAB, tcpA, tcpI, rtxA, hlyA and toxR. All strains contained one or more drug resistance related genes such as intI 1, intI 4 and sxt, and were resistant to two kinds of antibiotics at least. Among the 12 kinds of antibiotics, the resistant ratioes to kamamycin, trimethoprim-sulfamethoxazole, ampicillin and gentamicin were 11/13, 9/13, 7/13 and 7/13, respectively.</p><p><b>CONCLUSION</b>Molecular subtyping indicates possible epidemiological links among V.cholerae O139 in Shandong province, and almost all strains were toxigenic and drug resistant.</p>

Cytotoxicity of vibrio cholerae on madin darby bovine kidney cells

The cytotoxicity of cell-free culture filtrates of 31 isolates of Vibrio cholerae O1 and O139, 5 reference strains and 26 clinical isolates, was tested on Madin Darby Bovine Kidney [MDBK] cells and Vero cells. The 3-[4,5- dimethylthiazol-2-y]-2, 5-diphenyltetrazolium bromide [MTT] test was used to detect the effect of the filtrates on the proliferation and viability of cultured cell populations. The filtrates were prepared from serial ten-fold dilutions of inoculated AKI and APW broth media with and without the addition of polymyxin B. The APW culture filtrates of both V. cholerae O1 and O139 with and without added polymyxin B showed greater toxicity to MDBK cells as compared to AKI filtrates. The cytotoxicity of AKI-grown V. cholerae O139 to MDBK cells was greater than that of V. cholerae O1 grown in the same medium. The cytotoxicity of APW filtrates on Vero cells was low and only noted when polymyxin was added to the medium

Effects of enteropathogenic bacteria & lactobacilli on chemokine secretion & Toll like receptor gene expression in two human colonic epithelial cell lines.

Background & objectives: The intestinal epithelium is part of the innate immune system responding to contact with pathogenic or commensal bacteria. The objective of this study was to compare innate responses of intestinal epithelial cell lines to pathogenic bacteria and to lactobacilli. Methods: Two human intestinal epithelial cell lines, HT29 (enterocyte-like) and T84 (crypt-like), were exposed to pathogenic bacteria representative of non invasive (Vibrio cholerae O1 and O139), adherent (enterohaemorrhagic Escherichia coli, EHEC) or invasive (Salmonella Typhimurium and Shigella flexneri) phenotypes and to non pathogenic Lactobacillus rhamnosus GG or Lactobacillus plantarum. Interleukin-8 (IL-8) was measured in culture supernatant by ELISA, while mRNA from cells was subjected to quantitative reverse transcriptase PCR for several other chemokines (CXCL1, CCL5 and CXCL5) and for Toll-like receptors (TLR) 2, 4, 5 and 9. Results: V. cholerae, S. Typhimurium, S. flexneri and EHEC induced IL-8 secretion from epithelial cells into the medium. Salmonella, Shigella and EHEC, but not V. cholerae, significantly increased mRNA expression of CXCL1. None of the pathogens induced CCL5 or CXCL5. Salmonella and Vibrio significantly increased TLR4 expression, while Vibrio and EHEC decreased TLR5 expression. EHEC also decreased TLR9 expression. Lactobacilli attenuated the IL-8 response of the cell lines to V. cholerae, Salmonella, and EHEC but did not significantly change the IL-8 response to Shigella. Interpretation & conclusions: Distinct patterns of epithelial cell chemokine responses were induced by the bacterial pathogens studied and these were modulated by commensal lactobacilli. Alterations in TLR expression by these pathogens are likely to be important in pathogenesis.

A duplex nested PCR assay detecting of Vibrio cholerae and its application on environmental specimens / 中华预防医学杂志

<p><b>OBJECTIVE</b>To establish a duplex nested PCR assay system which is capable for detecting O1 and O139 groups of Vibrio cholerae simultaneously, and is applicable to environmental specimens from routine cholera surveillance.</p><p><b>METHODS</b>Based on nucleic acid sequences available in GenBank, six sets of primers were designed by PrimerSelect program of DNAStar, targeting the rfb gene that encodes the O antigens of O1 and O139 V. cholerae, respectively. The specificity of several primer combinations was tested. A duplex nested PCR assay system for simultaneously detecting O1 and O139 V. cholerae was established, subsequently, its sensitivity, specificity, reproducibility and field evaluation were tested. The sensitivity of this assay was evaluated by comparing detection limits of nested PCR and conventional PCR. Its reproducibility was tested by 32 positive samples (11 samples positive for O1, 21 samples positive for O139) from environmental surveillance. In addition, the selected amplicons from positive samples were sequenced and analyzed with relevant sequences.</p><p><b>RESULTS</b>This newly-established duplex nested PCR assay might distinguish O1 V. cholerae from O139 V. cholerae, based on fragment lengths of amplicons, with reliable reproducibility, and no specific amplification was observed as compared with other vibrio species. The sensitivity of this nested PCR was (15 000) higher than conventional PCR, and there was no interference observed with multiple primers and complicated templates in the same vial. In its field evaluation, 32 positive DNA samples were detected and be further confirmed with double or triple tests, implying reliable reproducibility and consistency of this system. These results indicated that this assay had reliable reproducibility. No amplification was observed in all negative specimens and also suggested the acceptable specificity of this assay. Sequence analysis of the selected amplification products revealed 100% homogeneous with relevant genes from V.cholerae, indicating that these amplicons were originated from V. cholerae.</p><p><b>CONCLUSION</b>This duplex nested PCR assay system should be rapid, sensitive and especially applicable to small laboratories, and be suitable for dynamic environmental surveillance.</p>

clinical study of vibriosis during 1999 in Al-Mansour childrens teaching hospital

Cholera is an acute infectious disease characterized by profuse watery diarrhea and vomiting. lt is caused by Vibrio Cholerae Ol and O139 sero-group. To find out clinical variety of the admitted cases of Vibriosis. Clinical features of the illness were studied, and fresh stool specimens were sent for culture. The stool is taken in seawater containers to the laboratory where further processing of the stool is done on alkaline peptone and TCBS medium. All patients presented with diarrhea and the majority had vomiting [65%], [37.5%] of the patients presented with severe dehydration and no patient died during this study. The epidemic mainly caused by Ogawa serotype [75%], and there was different antibiotic resistance recorded especially for trimethoprim [47.5%] and tetracycline [25%]. Nearly all cases in vitro were susceptible to cefotaxime

Changing characteristics of Vibrio cholerae: emergence of multidrug resistance and non-O1, non-O139 serogroups.

The serogroups and antimicrobial susceptibility patterns of V. cholerae isolated in Hubli, India during the years 2000 to 2004 were monitored. A total of 256 V. cholerae isolates were obtained during the study period, of which 129 (50.4%) belonged to serogroup O1 while the O139 and non-O1, non-O139 serogroups constituted 61 (23.8%) and 66 (25.8%) isolates, respectively. V. cholerae O1 Ogawa was the predominant isolate during the first 2 years of the study. However, this was replaced by V. cholerae non-O1, non-O139 serogroups in the following years. The V. cholerae, which was susceptible to most enteric antimicrobials in 2000, was found to be multidrug resistant in subsequent years, with the development of fluroquinolone resistance since 2002. Surveillance of the epidemiological and microbiological characteristics of V. cholerae provides useful information for managing cholera cases. The V. cholerae non-O1, non-O139 serogroups coupled with multiple antimicrobial resistance may form a group of emerging diarrheal pathogens in the tropics.

Distribution and molecular characteristics of Vibrio cholerae serogroups O1 and O139 isolates in estuary of Pearl River / 中华流行病学杂志

<p><b>OBJECTIVE</b>Through systematic monitoring of the number and strain types of O1 and O139 Vibrio cholerae in the Pearl River estuary waters to analyze it's relevance with the temperature of environment, and the relevance between strains in water and isolates during outbreaks and epidemics as well as to estimate the methods used for environmental water detection and the potential role in cholera surveillance program.</p><p><b>METHODS</b>Twenty-four stations along the Pearl River were selected and the water samples were collected monthly from March 2006 to February 2007. V. cholerae O1 and O139 strains were isolated from the samples. Real-time PCR established in our laboratory was used to detect V. cholerae O1 and O139. Air temperature and water temperature were collected during sampling. Pulsed field gel electrophoresis (PFGE) was applied in molecular typing of the isolates.</p><p><b>RESULTS</b>862 water samples were collected during the study period. A total number of 77 O1 and O139 V. cholerae were isolated in 67 water samples and the positive rates were 7.77% for isolation and 26.33% for real-time PCR. Seasonal trend of positive rates by month were approximately coincident with the change of water temperature. The positive rates in the stations in urban area were higher than those in other areas. Toxigenic O139 strains were found in one station located in downstream of a marine market. Most of the O1 and O139 isolates were non-toxigenic. No trend of seasonal variation of the strains was noticed. Within these 75 isolates, 49 PFGE patterns were identified and the patterns differed widely with the similarity of 57.4% - 100%.</p><p><b>CONCLUSION</b>V. cholerae existed as the natural habitat in estuary water of the Pearl River and showed obvious genetic diversity. Data from monitoring waters might show the separation of strains with certain seasonal association. But the crowd did not show the relationship between the infections. Results from water surveillance program might provide indicators on the appearance of cholera pathogen which might be used in assessing the environmental risk of cholera epidemics as well as the alert of cholera.</p>

Identification and molecular study on vibrio cholerae in sea products / 中华预防医学杂志

<p><b>OBJECTIVE</b>To investigate the serologic type, phage-biotype and toxic factor of Vibrio cholerae isolated from different sea products, analyze the relation between the Vibrio cholerae in sea products and cholera epidemiology, and provide references for forecasting cholera epidemic situation and drawing out a preventing plan.</p><p><b>METHOD</b>The biotype of strains isolated was analyzed by using type and phage-biotype serological methods. The toxic gene was detected by PCR.</p><p><b>RESULTS</b>The constituent ratio of V. cholerae O139, Ogawa and Inaba were, respectively, 48.44%, 20.31% and 31.25% in 64 strains of V. cholerae. The result of phage-biotype showed that the 26 strains of V. cholerae O1 were all non-epidemic strains. The result of toxic gene detecting showed that positive rate of V. cholerae O139 was higher than those of Ogawa and Inaba.</p><p><b>CONCLUSION</b>The positive rate of toxic gene in V. cholerae O139 was high and the V. cholerae O139 was mainly in turtle, breed aquatics water and crustacean, so these sea products were the important sectors in cholera prevention and control.</p>

Study on the application of pulsed-field gel electrophoresis regarding infection sources identification during an outbreak of Vibrio cholerae in Jiangxi Province / 中华流行病学杂志

<p><b>OBJECTIVE</b>To study the correlation between Vibrio cholerae strains isolated from natural enviroment and fishery products and the source of infection during V. cholerae outbreaks.</p><p><b>METHODS</b>Cholera toxin gene was detected by polymerase chain reaction (PCR) amplification. Pulsed-field gel electrophoresis (PFGE) was used to subtype the isolates. Results of PFGE were analyzed and clustered by BioNumerics software (Version 4.0).</p><p><b>RESULTS</b>During the outbreaks, a total number of thirty O139 V. cholerae related serogroups were collected from patients, carriers, sewage and fishery products were identified and proved to be toxigenic. They could be clustered into four PFGE patterns when digested by Not I. These two V. cholerae outbreaks were caused by the same source of infection because of the following reasons: (1) PFGE patterns of the predominant strains isolated from two outbreaks were identical; (2) they were identical to the PFGE patterns of the strains isolated from the green turtle and rana catesbiana which were bought from the same wholesale store.</p><p><b>CONCLUSION</b>Green turtle and rana catesbiana that were contaminated by toxigenic O139 V. cholerae strains seemed to be the source of infection causing the O139 V. cholerae outbreaks in Jiangxi province. Rapid laboratory surveillance and epidemiologic investigation were important in identifying the source of infection during the outbreaks of V. cholera.</p>

Development and application of real-time polymerase chain reaction to detect Vibrio cholerae O1 and O139 in river water / 中华流行病学杂志

<p><b>OBJECTIVE</b>To develop a real-time SYBR Green polymerase chain reaction (PCR) for detection of Vibrio cholerae serogroups O1 and O139, and to evaluate its reliability through detection of estuary water samples.</p><p><b>METHODS</b>O antigen rfb genes specific for O1 and O139 were used for the design of PCR primers. The real-time SYBR Green PCR system in detecting O1 and O139 specific rfb genes in one tube was developed, and its sensitivity, specificity and reproducibility were evaluated. The ability of the real-time PCR in detection of estuary water samples was compared with the routine PCR and bacteria isolation.</p><p><b>RESULTS</b>The amplification of O1 or O139 specific target gene could be detected according to the melt curve temperature of amplicons. No amplification was observed in the templates of other 10 non-cholerae vibrios. When comparing to the real-time PCR to bacteria isolation in detection of 524 estuary water samples, it showed high sensitivity, plus also positive in real-time PCR detection among all the samples in which bacteria of O1 or O139 were isolated.</p><p><b>CONCLUSION</b>The real-time SYBR Green PCR could be used as the first step of rapid environment screen of V. cholerae in water samples thus might enhance the efficiency of isolation in screening of large amount of water samples.</p>

Application of pulsed-field gel electrophoresis typing in tracing and carrying out surveillance programs on O139 cholera outbreaks / 中华流行病学杂志

<p><b>OBJECTIVE</b>To study the characteristics of molecular typing and phylogenic relationship among the Vibrio cholerae serogroup O139 strains isolated from environment and sea food samples during cholera outbreaks, in Sichuan province in 2004 and to trace the source of infections so as to support the ascertainment of epidemic control strategy.</p><p><b>METHODS</b>Cholera toxin gene was detected by polymerase chain reaction amplification. Pulsed-field gel electrophoresis (PFGE) was used for subtyping of isolates and clustering of patterns was analysed with the software BioNumerics.</p><p><b>RESULTS</b>In all the 72 strains under analysis, 68 appeared to be toxigenic while 4 from river water derived isolates were toxin gene negative. Sixty-seven strains were clustered into 16 PFGE patterns when digested with Not I. The patterns of toxigeinc O139 strains isolated from turtles in the markets were identical with the patterns of strains appeared in the outbreaks respectively. The PFGE patterns of isolates from different outbreaks were inconsistent.</p><p><b>CONCLUSION</b>The sources of infection causing these outbreaks were complicated. Contaminated turtles might also be one of the major sources of outbreaks when being served at the dinner parties in Sichuan in 2004.</p>

Molecular phylogenetic analysis of Vibrio cholerae O1 El Tor strains isolated before, during and after the O 139 outbreak based on the inter-genomic heterogeneity of the 16S-23S rRNA intergenic spacer regions.

We have cloned, sequenced and analysed all the five classes of the intergenic (16S-23S rRNA) spacer region (ISR) associated with the eight rrn operons (rrna-rrnh) of Vibrio cholerae serogroup O1 El Tor strains isolated before, during and after the O 139 outbreak. ISR classes 'a' and 'g' were found to be invariant, ISR-B (ISRb and ISRe) exhibited very little variation, whereas ISR-C (ISRc, ISRd, and ISRf) and ISRh showed the maximum variation. Phylogenetic analysis conducted with all three ISR classes (ISR-B, ISR-C and ISRh) showed that the pre-O 139 serogroup and post-O 139 serogroup O1 El Tor strains arose out of two independent clones, which was congruent with the observation made by earlier workers suggesting that analyses of ISR-C and ISR-h, instead of all five ISR classes, could be successfully used to study phylogeny in this organism.

Survival and growth of Vibrio cholerae O139 inside Acanthamoeba / 中华流行病学杂志

<p><b>OBJECTIVE</b>To study the survival and growth of Vibrio cholerae inside the Acanthamoeba polyphage.</p><p><b>METHODS</b>Survival and growth of Vibro cholerae O139, co-cultured with Acanthamoeba polyphaga, was observed inside the trophozoites and cysts, using Gram stain and electron microscope.</p><p><b>RESULTS</b>Viable O139 was observed inside the amoebal vacuoles in 24 hours. Vacuoles were filled with more bacteria along with the longer period of co-culture. The process of O139 infection with Amoebae would include uptake, formation of O139 vacuole, multiplication, trophozoites lysed and expel under electron microscopy. Some infected trophozoites could subsequently encyst and the surviving O139 could locate in the vesicles inside the cysts.</p><p><b>CONCLUSION</b>O139 might survive and multiply in the trophozoites and reside inside the cysts of Amoebae, suggesting that Acanthamoebae might serve as one of the environmental hosts of Vibro cholerae.</p>

Re-emergence of El Tor vibrio in outbreak of cholera in & around Nagpur.

Contrary to earlier outbreaks of cholera due to Vibrio cholerae O139 during 1993 and its reemergence in 1998 in and around Nagpur and only sporadic episodes thereafter for next couple of years, a large outbreak was encountered between June and October 2003. V. cholerae 01 El Tor were isolated in 198 cases, of which 152 were Ogawa, 3 Inaba, 4 Hikojima and 39 were non agglutinating (NAG) vibrios. No isolate of V. cholerae O139 was detected during the entire outbreak. The isolates were multi drug resistant to antibiotic susceptibility tests. This points to the resurgence of V. cholerae El Tor Ogawa causing outbreaks of cholera with a discernible increase in the incidence of multi drug resistant strains.

Rice-ORS versus glucose-ORS in management of severe cholera due to Vibrio cholerae O139 Bengal: a randomized, controlled clinical trial.

This study examined the comparative efficacies of rice-based oral rehydration solution (R-ORS) and glucose-based oral rehydration solution (G-ORS) in the management of severe cholera due to Vibrio cholerae O139 Bengal that causes epidemic cholera in many developing countries. Stool culture-proved adult male patients with severe cholera due to V. cholerae O139 Bengal were randomly assigned in a 1:1 ratio to receive either R-ORS or G-ORS after their initial rehydration with intravenous (i.v.) fluid and subsequently four hours of observation. They also received the usual hospital diet and tetracycline capsules (500 mg 6 hourly for three days) immediately after their enrollment in the study. The primary outcomes for observation were stool output during the first 24 hours after intervention and treatment failure as measured by the incidence of re-institution of i.v. fluid after initiation of trial therapy and duration of diarrhoea. Of 113 patients finally included in the study, 57 received R-ORS and 56 G-ORS. The admission characteristics of the two treatment groups were comparable. No significant differences in the first 24 hours of median (inter-quartile range) stool output [179 (67-206) g/kg in R-ORS group vs 193 (80-237) g/kg in G-ORS group; p = 0.52], incidences of unscheduled i.v. fluid requirement [21% (12/57) in R-ORS group vs 25% (14/56) in G-ORS group; p = 0.78], and median (inter-quartile range) duration of diarrhoea [32 (24-48) hours in R-ORS group vs 32 (24-56) hours in G-ORS group; p = 0.64] were observed. It is concluded that rice-based ORS is effective but not superior to standard glucose-based ORS in the management of adult males with severe cholera due to V. cholerae O139 Bengal.

Emergence and re-emergence of Vibrio cholerae 0139: an epidemiological study during 1993-2002 at Nagpur, Central India.

The pattern of Vibrio cholerae 01 and 0139 isolates at Indira Gandhi Medical College and Mayo General Hospital, Nagpur from 1993 to 2002 is presented. Emergence of the novel serotype 0139 in 1993 was followed by periods of quiescence and re-emergence. For the first time after 1993, the 0139 isolates out numbered 01 isolates in 2001. The peculiar epidemiological pattern is compared with other reports.

Quinolone susceptibility of Vibrio cholerae O1 & O139 isolates from Vellore.

BACKGROUND & OBJECTIVES: Vellore is an endemic area for cholera. The relative prevalence of clinical cases of Vibrio cholerae O1 and O139 has been fluctuating. Few studies have examined the susceptibility of local isolates to quinolones. The objective of the present study was to look at quinolone susceptibility and determine MIC of ciprofloxacin to representative clinical isolates of V. cholerae O1 and O139 in Vellore, obtained between 1997 and 1999. METHODS: Antimicrobial susceptibility testing of V. cholerae strains was performed by disc diffusion technique and MIC determination by E test. RESULTS: Five of 30 O1 and all the O139 serogroup isolates were susceptible to nalidixic acid. All isolates of both serogroups were sensitive to norfloxacin. All isolates of both serogroups gave MIC results in the susceptible range to ciprofloxacin; the MICs being lower for V. cholerae O139 (MIC50 = 0.004 microgram/ml and MIC90 = 0.047 microgram/ml) than for O1 serogroup (MIC50 = 0.38 microgram/ml and MIC90 = 0.5 microgram/ml). INTERPRETATION & CONCLUSION: V. cholerae O1 and O139 show differences in quinolone susceptibility, the reason for this is not clear. This could be because of longer exposure of the O1 serogroup to quinolone antimicrobials as compared to the O139 serogroup.

A study on genetic polymorphism of rRNA gene pattern of Vibrio cholerae O139 in China / 中华流行病学杂志

<p><b>OBJECTIVE</b>To investigated the genetic polymorphism of the isolated strains using ribotyping method.</p><p><b>METHODS</b>One hundred twenty-two strains of V. cholerae O139 isolated from different areas of China from 1993 to 1999 were selected and characterized with ribotyping, including 16s rDNA and 23s rDNA probes.</p><p><b>RESULTS</b>One hundred twenty-two strains were differentiated into 10 different ribotypes (RT1-RT10) on the basis of rRNA gene probes hybridization (with Bgl I digestion), which consisted of 7 - 9 bands between 12 and 1.5 kb in size. RT1 and RT3, as two predominant ribotypes, comprised most number of the strains which spread to the extensive range. Nine strains, which are negative to ctxAB, zot and RS individually, belong to 4 special ribotypes. The dendrogram revealing genetic relationship among different clones of V. cholerae O139 showed that the clones belonging to RT1 and RT2 had genetic similarity on high degree, although they were isolated from different regions. The two predominant ribotypes (RT1 and RT3) were distant in genetic relationship.</p><p><b>CONCLUSION</b>Results showed the clonal diversity and the wide area distribution of V. cholerae O139 strains in China, suggesting the multiple origins of O139 epidemics.</p>