Vibrio cholerae ; classification ; pathogenicity

Aims: Coral diseases have emerged over the last several decades, causing a loss of live coral cover in the Caribbean and Indo-Pacific reefs. Hence, microbiological and disease cultural techniques are commonly used to investigate their causative microbial agents. This is the first study to identify the potential of pathogenic Vibrio spp. isolated from apparently white syndrome (WS) coral disease in Tioman Island Marine Park using biochemical and molecular techniques. Methodology and results: The Vibrio colonies were isolated from 108 samples of WS infected corals (Acropora cytherea and Montipora aequituberculata) including seawater, sediment and algae found adjacent to infected coral colonies. A total of one hundred representative Vibrio isolates were characterized and most of them (n=50) were identified as V. vulnificus, V. alginolyticus and Photobacterium damselae following biochemical analysis. The molecular analysis revealed six Vibrio spp. (V. coralliilyticus, V. hepatarius, V. brasiliensis, V. tubiashi, V. campbellii, V. ishigakensis) and one Photobacterium rosenbergii. Vibrio coralliilyticus isolated from all infected coral samples may be highly responsible for the sign of WS disease. Conclusion, significance and impact of study The findings of this study provide baseline data and information on potential coral pathogens identified in the coastal waters of Tioman Island. Etiological disease study is suggested to validate their severity and virulence factors in the future.
Vibrio--pathogenicity ; Anthozoa

Genotype ; Humans ; Seafood ; microbiology ; Vibrio Infections ; epidemiology ; microbiology ; Vibrio parahaemolyticus ; drug effects ; genetics ; pathogenicity

Shewanella algae infections are rare in humans. Previously reported cases of S. algae have mainly been associated with direct contact with seawater. We report a case of primary S. algae bacteremia occurring after the ingestion of raw seafood in a patient with liver cirrhosis that presented a fulminent course of necrotizing fasciitis.
Bacteremia/*blood ; Fasciitis, Necrotizing/*microbiology ; Fatal Outcome ; Humans ; Korea ; Liver Cirrhosis/physiopathology ; Male ; Middle Aged ; Seafood/microbiology ; Sepsis/*microbiology ; Shewanella/*pathogenicity ; Vibrio/*pathogenicity ; Vibrio Infections/*blood

BACKGROUNDVibrio vulnificus (Vv) is an estuarine bacterium that can cause primary septicemia as well as serious wound infections. However, little is known about the mechanisms by which Vv infects dendritic cells (DCs) and its effects on cytoskeleton. In this study, we aimed to investigate the invasion, internalization, and the organelles damage of the cultured dendritic cells (a DC 2.4 strain) during Vv infection.

METHODSThe study model was the cultured DCs infected by a Vv 1.758 strain. Electron microscopy was used to observe the localization of bacteria at the different time points of infection, cell morphology, and the process of organelles changes. The cytoskeleton structure including the microfilaments and the microtubules rearrangement was examined under a fluorescence microscope.

RESULTSThe Vv were pinocytosised into the DC cells through double-sides, and localized at 1 - 2 mm of the inner side membrane. It took 1.3, 1.9, and 3.4 hours to reach the infection ratio of 25%, 50%, and 75%, respectively. Using electron microscopy, the DCs had been observed to have developed chromatin aggregation within 4.0 hours, and significant cytoskeleton structure disruption was noted within 6.0 hours.

CONCLUSIONThe high lethality of Vv infection may be associated with the direct disruption of the DCs cytoskeleton structure.

Animals ; Apoptosis ; physiology ; Cells, Cultured ; Cytoskeleton ; metabolism ; ultrastructure ; DNA Fragmentation ; Dendritic Cells ; metabolism ; microbiology ; ultrastructure ; Mice ; Microscopy, Electron ; Microscopy, Electron, Transmission ; Vibrio Infections ; metabolism ; Vibrio vulnificus ; pathogenicity

Vibrios are universal conditioned-pathogenic bacteria in marine culture environment, and the outbreak of vibrio disease resulted in a serious damage to aquaculture. Considering that vibrio disease in aquatic species, especially fishes, usually originated from mixed infection of different species (serotypes or subspecies) of vibrios, it is important to select the potential cross-protective protein antigens as candidates of polyvalent or combined vaccines. In present research, several strains of vibrios were isolated from infected large yellow croaker (Pseudosciaena crocea) and subsequently identified as six strains of V. harveyi, one V. parahaemolyticus and one V. alginolyticus by physiological, biochemical and molecular biological methods. Their outer membrane proteins (OMPs) were extracted and the SDS-PAGE and Western blotting results show that three immuno-blots with common molecular weight presented at approximate 45 kDa, 35 kDa and 22 kDa on their OMP electrophoretogram, indicating the existence of antigens with cross-protection in their OMPs. With the aids of combination of two-dimensional electrophoresis (2-D) and Western blotting and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS), a deduced porin (GenBank Accession No. ZP_01260407) from V. alginolyticus and a maltoporin precursor (GenBank Accession No. NP_801154) from V. parahaemolyticus were able to react with polyclonal antibody to whole V. harveyi, suggesting these two proteins could act as the cross-protective antigens and the vaccines prepared with these porins would be probable to bring cross protection to three different vibrios.
Animals ; Antigens, Bacterial ; immunology ; Bacterial Outer Membrane Proteins ; immunology ; Cross Reactions ; Fish Diseases ; microbiology ; Perciformes ; microbiology ; Vibrio ; classification ; immunology ; isolation & purification ; pathogenicity ; Vibrio Infections ; microbiology

OBJECTIVETo explore the phenetic and genetic features of clinical Vibrio parahaemolyticus strains from 2007-2009 in China.

METHODSA total of 135 clinical Vibrio parahaemolyticus strains, isolated from Zhejiang, Jiangsu, Sichuan, Guangxi, Liaoning Provinces during 2007 to 2009, were selected for the research. The occurrence of virulence genes thermostable direct hemolysin (tdh) and TDH-related hemolysin (trh), species-specific genes thermolabile hemolysin (tlh), toxR, VPM and gyrB, the pandemic clone gene markers(GS-PCR, PGS-PCR, orf8 and HU-α) in 135 Vibrio parahaemolyticus strains was detected by PCR. The antimicrobial susceptibilities to eight antimicrobial agents of the experimental strains were determined by the broth microdilution method. All strains were serotyped and underwent the cluster analysis with pulsed-field gel electrophoreses.

RESULTSThe results of PCR methods claim that all experiment strains carry species-specific genes such as tlh, toxR, gyrB, VPM. Among clinical strains, 85.9% (116/135) carry tdh and/or trh. 85.2% (115/135) were positive for tdh, and 3.0% (4/135) were positive for trh; while 3 strains carried both.66.7% (90/135) , 80.7% (109/135) , 65.2% (88/135) , 66.7% (90/135) clinical strains carried the genes of GS-PCR, PGS-PCR, orf8, HU-α, respectively. The results of antibiotics susceptibility test showed that 8.1% (11/135) strains were resistant to at least one agent, including 9 strains were resistant to ampicillin, 2 strains were resistant to trimethoprim and sulphamethoxazole, and 1 strain were resistant to tetracycline. All clinical strains were sensitive to cefotaxime, ceftazidime, gentamicin, ciprofloxacin and chloromycetin.Serological analysis of the O and K antigens claimed that a total of 29 serotypes were identified for clinical strains, predominantly O3, O4 and O1 groups, accounting for 89.6% (121/135). O3: K6 was dominant serotype, accounting for 56.3% (76/135). The pandemic flora in China included O3: K6, O4: K68, O1: K36, O1: K25, O1: K5 and O3: K29 serotypes.Genomic DNAs of 135 clinical strains were digested with SfiI and NotI, the molecular size of PFGE restriction fragments used for analysis mainly ranged from 30-700 kb.When subjected to UPGMA clustering, 6 and 9 clusters were grouped by SfiI and NotI, and the minimal similarity was 52.6% and 58.7%, and pandemic flora were located in C groups and D group, respectively.

CONCLUSIONMost of Vibrio parahaemolyticus strains isolated from clinical sources in China were pathogenic. The pandemic clone, especially O3: K6 was prevalent. The GS-PCR and HU-α genes were reliable markers to identify the pandemic flora. The serotype by PFGE was reliable to distinguish the pandemic flora and the sporadic strains.

China ; epidemiology ; Drug Resistance, Bacterial ; Genes, Bacterial ; Humans ; Molecular Epidemiology ; Vibrio Infections ; epidemiology ; microbiology ; Vibrio parahaemolyticus ; genetics ; isolation & purification ; pathogenicity ; Virulence ; genetics

Lipoprotein plays a role in the host defense against bacterial infection, and its serum level has been demonstrated to be an important prognosis factor of survival. We have previously demonstrated that LDL directly inactivates the hemolytic activity of Vibrio vulnificus cytolysin (VVC) in vitro. The object of this study was therefore to examine whether the LDL-mediated inactivation of VVC leads to protection against lethal infection of V. vulnificus in vivo, using wild and VVC-deficient V. vulnificus strains. Unexpectedly, we found that LDL protects mouse lethality induced by VVC-deficient as well as wild V. vulnificus strain. We also demonstrated that LDL blocks V. vulnificus LPS-induced lethality in mice. These results suggest that LDL preferentially act on endotoxin rather than exotoxin in the protection against V. vulnificus-induced mice lethality.
Animals ; Disease Models, Animal ; Female ; Humans ; Lipopolysaccharides/*antagonists & inhibitors ; Lipoproteins, LDL/*pharmacology ; Mice ; Mice, Inbred ICR ; Perforin/antagonists & inhibitors/genetics ; Vibrio Infections/prevention & control ; Vibrio vulnificus/*drug effects/genetics/*pathogenicity ; Virulence/drug effects/genetics/physiology

We identified 6 sucrose-fermenting Vibrio vulnificus strains and examined their virulence characteristics. They were all encapsulated, motile, capable of producing toxins and utilizing transferrin-bound iron, cytotoxic to cultured cells, and virulent enough to kill mice. They could be definitely identified only by genetic identification methods such as PCR, and not by conventional culture-based identification methods such as API 20E (bioMerieux, France). These results indicate that it is essential to adopt genetic approaches as early as possible in order to avoid misdiagnosis of such strains, especially in clinical situations.
Animals ; Bacterial Proteins/genetics ; Fermentation ; Mice ; RNA, Ribosomal, 16S/genetics ; Sequence Analysis, DNA ; Sucrose/*metabolism ; Vibrio vulnificus/genetics/growth & development/*pathogenicity ; Virulence

The morbidity of travelers' diarrhea (TD) is still high. This study examined the incidence of common pathogens and characteristics of TD among Korean travelers who visited South-East Asian countries. We performed a prospective study involving 479 Korean travelers with diarrheal disease from February 2009 to April 2009 and stool samples were examined and questionnaire surveys were done after arrival. Enterotoxigenic Escherichia coli (ETEC) was found in 36.0% of TD cases, as were the following: Enteroaggregative Escherichia coli (EAEC) in 27.0%, Vibrio parahaemolyticus in 13.1%, and Norovirus in 11.5%. The detected rate of classic TD was higher in men (P = 0.007), in patients who had a shorter duration trip (P = 0.023) and in patients who drank more than 1 liter of water per day (P = 0.037). Positive stool culture rates were higher in men (P = 0.005), in hospitalized patients (P = 0.013). and in those who consumed impure water or raw foods (P = 0.033). A higher severity of disease corresponded to a significantly higher culture positivity rate (P = 0.029). We should consider the possibility of other pathogens in addition to ETEC in patients with TD who visit South-East Asia. Travelers need to educate about risk factors associated with TD.
Adolescent ; Adult ; Aged ; Asia, Southeastern/epidemiology ; *Asian Continental Ancestry Group ; Caliciviridae Infections/epidemiology/virology ; Child ; Diarrhea/epidemiology/*etiology/microbiology/virology ; Escherichia coli/isolation & purification/pathogenicity ; Escherichia coli Infections/epidemiology/microbiology ; Feces/microbiology/virology ; Female ; Humans ; Male ; Middle Aged ; Norovirus/isolation & purification/pathogenicity ; Prospective Studies ; Questionnaires ; Republic of Korea ; Risk Factors ; *Travel ; Travel Medicine ; Vibrio parahaemolyticus/isolation & purification/pathogenicity ; Young Adult