cholera vaccines

..We conclude that the non-reactogenic, immunogenic and protective strain 638 is robust and can withstand the fermentation processes required for large-scale production of a vaccine...

..Appropriate case management has reduced deaths from diarrhoeal disease by an estimated 3 million per year compared with 20 years ago. Vaccination was thought to have no role for cholera, but new oral vaccines are showing great promise...

Oral cholera vaccines consisting of killed whole cells have been available for many years, but they have not been used extensively in populations with endemic disease...

..Responses to V. cholerae O139 were less pronounced but followed a similar pattern. We demonstrate that in a cholera-endemic area, the vaccine elicited vibriocidal responses after a single-dose of the vaccine...

..Local efficacy measures can help public health practitioners make better decisions about when and where to vaccinate populations. The concepts offered in this study are pertinent for any health intervention trial, not just vaccines...

..cholerae and the importance of our findings for the development of an environmentally safer live attenuated cholera vaccine...

..The potential modulation of the immune response to oral vaccines by geohelminth parasites has important implications for the design of vaccination campaigns in geohelminth-endemic areas...

..Internationally licensed, killed whole-cell based oral cholera vaccines (OCVs) have been available for over a decade, but have not been used for the control of cholera...

Cholera continues to occur globally, particularly in sub-Saharan Africa and Asia. Oral cholera vaccines have been developed and have now been used for several years, primarily in traveller populations...

..This vaccine was reformulated to meet WHO requirements. We assessed the safety and immunogenicity of the reformulated bivalent (Vibrio cholerae 01 and 0139) killed whole cell oral vaccine in a cholera endemic area in Kolkata, India...

Killed oral cholera vaccines (OCVs) are available but not used routinely for cholera control except in Vietnam, which produces its own vaccine...

..Fears of cholera outbreaks are often rife in such conditions and the pertinence of using cholera vaccines, now available on the market, merit attention...

..The A-P combination was highly effective for malaria prophylaxis, without interfering with the in vivo immunogenicity of CVD103-HgR and Ty21a vaccines, and it could therefore be simultaneously administered with these vaccines...

..Our analysis incorporated new findings on vaccine herd protective effects...

This study aims to measure the private demand for oral cholera vaccines in Hue, Vietnam, an area of relatively low endemicity of cholera, using the contingent valuation method.

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..lumbricoides infections impair the immune response to oral cholera vaccine, particularly in subjects of non-O blood groups...

..9-84.6%) in the target population. Retrospective analysis suggests that mass vaccination with oral cholera vaccines can be a useful adjunct tool for controlling outbreaks, particularly if implemented early in association with ..

..89. Mass immunization with this locally-produced oral, killed cholera vaccine was found to be feasible and affordable with attainment of high vaccination coverage...

Serum responses to oral cholera vaccines were assessed in three paediatric vaccine trials, two in León, Nicaragua and one in Stockholm, Sweden...

..We also consider a setting in which the desire is to show that the difference between immune response rates for vaccine and control is greater than a specified value...

..The responses to the reduced dose was lower. These studies demonstrate that Peru-15 at a dose of 2x10(8)cfu is safe and immunogenic in children in Bangladesh...

..cholerae 3008. We recommend that additional vaccine lots of 638 be prepared under good manufacturing practices for further evaluation...

..A lower immunological response against cholera toxin B subunit was detected.CONCLUSIONS. The safety and immunogenicity of this Peru-15 vaccine candidate indicates the usefulness of future studies in Bangladesh, where cholera is endemic...

..Thus, zinc enhanced vibriocidal antibody response, but suppressed CT-antibody response, suggesting that zinc supplementation has different modulating effects on vibriocidal antibody response and CT-antibody response...

BACKGROUND: New-generation, orally administered cholera vaccines offer the promise of improved control of cholera in sub-Saharan Africa...

BACKGROUND: Decisions about the use of killed oral cholera vaccines, which confer moderate levels of direct protection to vaccinees, can depend on whether the vaccines also provide indirect (herd) protection when high levels of vaccine ..

..The overall vaccine effectiveness 3-5 years after vaccination was 50% (9-63%). This low-cost, easily administered vaccine should be considered as a tool for the control of cholera...

..cholerae O139. Consequently, this assay may be useful in studies of both O139-infected patients and recipients of O139 vaccines...

..In this contribution we address selected aspects of the risk assessment of live attenuated bacterial vaccines covered in the course of the registration of vaccine strain CVD 103-HgR as a recombinant live oral vaccine against cholera...

..Both vaccines display 85-98% efficacy against severe rotavirus disease and an excellent tolerability with no difference in side reactions to the placebo controls, particularly with respect to intussusceptions...

..The persistence or control of cholera in Africa will be a key indicator of global efforts to reach the Millennium Development Goals and of recent commitments by leaders of the G-8 countries to increase development aid to the region...

..Although infection generated stronger responses than vaccination, the proportion of responders was similar among individuals with low background titers...

..cholerae vaccine strains effectively protected these vaccines from CTXphi infection. Introduction of rstR into V. cholerae vaccine strains should enhance their biosafety...

..These results indicate that specific regions of TcpA, including those delineated by the peptides used in this study, have the potential to be incorporated into an effective defined subunit vaccine for cholera...

..Since 1999, the World Health Organization has advocated the use of oral cholera vaccines as an adjunct in the control of cholera...

..Peak stool V. cholerae excretion among placebo recipients was 1.1 x 10(7) CFU/g and among vaccinees was 4.9 x 10(2) CFU/g (P < 0.001). This vaccine could therefore be a safe and effective tool to prevent cholera in travelers...

Two meetings of the World Health Organization (WHO)-in 1999 and 2002-had examined the potential use of oral cholera vaccines (OCVs) as an additional public-health tool for the control of cholera...

In refugee settings, the use of cholera vaccines is controversial since a mass vaccination campaign might disrupt other priority interventions...

..CONCLUSION: It was concluded that biv-WC was safe and immunogenic, that it could be administered without buffer, and that it could elicit robust immune responses even in children, for whom the risk of endemic cholera is highest...

..These results encourage further evaluations of this single-dose, oral cholera vaccine in high-risk populations such as refugees in sub-Saharan Africa...

..cholerae for at least 6 months. No commercially available cholera vaccine protects against disease caused by V. cholerae serogroup O139. New cholera vaccines are being developed.

..However, a vaccine against cholera is now available that has proven efficacy and tolerability in mass vaccination campaigns in low-income countries, and among travellers...

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..To investigate the effectiveness of an oral cholera vaccine (Dukoral((R))) in preventing travellers' diarrhoea...

To estimate household willingness to pay (WTP) for cholera vaccines in a rural area of Bangladesh, which had participated in a 1985 oral cholera vaccine trial.

..We estimate average household willingness to pay (WTP) for cholera vaccines in Beira to be 2005 US$ 8.45...

..We found that this reformulated oral killed whole-cell cholera vaccine was safe, well tolerated and highly immunogenic...

..Morbidity is enhanced in C3H/HeJ mice, indicating that Toll-like receptor 4 is important for infection containment...

..The VC incorporation, physicochemical characterization data, and the animal results obtained in this study may be relevant in optimizing the vaccine incorporation and delivery properties of these potential vaccine targeting carriers...

Licensed as well as candidate cholera vaccines available at the present requires the dose preparation (included buffer) at the moment of application...

..We have reviewed the most recent hypothesis on the ecology of cholera, in particular on the origin of epidemics. Recent developments in the fields of therapy and prophylaxis of cholera are also reported...

..cholerae exposed or vaccinated individuals. This review discusses the current cholera vaccines and compares the advantages of a cholera subunit vaccine to that of the whole cell vaccines...

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..All the strains were sensitive to tetracycline and doxoclycine. They showed their attenuation and immunogenicity in animal models. The strains 638 and 1333 proved to be immunogenic and non reactogenic in volunteers...

..In the present study, this has been applied to the development of a recombinant probiotic for treatment and prevention of cholera, caused by Vibrio cholerae...

..Thus, IEM109 is a stable vaccine candidate that evokes not only antitoxic and vibriocidal immunities, but also resistance to the El Tor biotype CTX Phi infection...

..Foreign antigens can be delivered to the immune system with cholera vaccines by expressing heterologous antigens in live attenuated vectors, as fusion proteins with cholera toxin ..

..VCUSM2 is thus a potential vaccine candidate against infection by V. cholerae O139...

..The most immunogenicity in evoking serum IgG, IgA and IgM responses was immunized by VC-loaded PLA/PEG-blended microparticles, and with VC challenge in mice, the survival rate (91.7%)...

..Therefore, further attenuation of non-toxigenic V. cholerae strains by means of stable deletions in nutritional genes seems to be the most promising way to obtain acceptable vaccine candidates...

..The results obtained on the rabbit model are discussed in relation to the efficacy of this vaccine in human volunteers and in a recent field test...

..Developments in the molecular characterization of V. cholerae are providing new information to explain the genetic and epidemiological variations...

..All the strains here obtained showed similar phenotypes in traits known to be remarkable for live cholera vaccines irrespective of their motility phenotypes, although the hapA mutants had a 10-fold decrease in their ..

..typhi Ty21a as well as V. cholerae CVD 103-HgR-are employed as vaccines against typhoid and cholera, respectively. In this manuscript, we review the immune responses that are induced by these vaccines, with a focus on mucosal immunity...

..More recently, researchers have been elucidating the environmental lifestyle of V. cholerae. This review provides an overview of the current knowledge of both the host- and environment-specific physiological attributes of V. cholerae...

..Dysregulation of Dam activity may provide a means for the development of vaccines against varied bacterial pathogens...

..These MAbs were used in immunoblotting studies to assess seroconversion to El Tor TCP following cholera. Clear anti-pilus responses were observed in five of nine patients...

..Further studies are required to increase understanding of the reason for differential protection...

Vibrio cholerae is a noninvasive enteric bacterium that causes the severe diarrheal disease cholera. Candidate cholera vaccines have been engineered by deleting genes encoding known virulence factors in V...

..cholerae cells and hence reduce delivery of toxin to receptors. These mucinases, neuraminidase and proteinases, may be useful components of acellular, toxoided cholera vaccines for human immunisation.

..Whole-cell, killed, and live-attenuated oral cholera vaccines are in use...

..Some of these diseases are preventable, and vaccination remains a cornerstone of travel medicine. Vaccines that are important for international travel are reviewed, in a succinct update based on the most recent literature...

..cholerae O1. Further studies are needed to determine if such responses are also stimulated after immunization with oral cholera vaccines and if these responses play a role in protection following exposure to cholera.

Vaccine reactogenicity has complicated the development of safe and effective live, oral cholera vaccines. Delta ctx Vibrio cholerae mutants have been shown to induce inflammatory diarrhea in volunteers and interleukin-8 (IL-8) production ..

..Using the panel it was possible to identify specifically all strains and isolates of hog cholera virus, hog cholera vaccines derived from 'C' strains, and most strains of bovine viral diarrhoea/border disease (BVD/BD) viruses (..

..To date, two oral cholera vaccines have been shown to offer good (more than 70%) short-term (one year) protection...

..Because of the poor uptake of the new typhoid and cholera vaccines licensed since 1985, it will be important to create reliable, long-term demand for the next generation of ..

Live oral candidate cholera vaccines have previously been constructed by deletion of Vibrio cholerae sequences encoding the enzymatically active A subunit of the cholera toxin...

..will continue to confound our ability to eradicate cholera through improvements to infrastructure, and thus cholera vaccines are needed...

..Pilin or peptides corresponding to the epitopes recognized by the monoclonal antibodies represent possible immunogens for improved cholera vaccines.

..The need for the continuous serogroup surveillance and monitoring of the environmental waters and the role of LPS in the designing of newer cholera vaccines has been discussed briefly in conclusion.

..These analyses reveal intriguing trends for Genentech's monovalent rgp120 HIV-1 vaccine, for two whole-killed-cell oral cholera vaccines, and for other vaccines.

..cholerae Ogawa and O139 strains. These results have significance in the development of vaccines to V. cholerae, as the hyperexpression of these OMP encoding genes in vaccine strains may improve the efficacy of cholera vaccines.

..Furthermore, the RTX toxin of V. cholerae may be associated with residual adverse properties displayed by certain live, attenuated cholera vaccines.

..No vaccine against cholera or ETEC diarrhea is approved in the United States, and cholera vaccines used elsewhere have significant limitations...

..No vaccine against cholera or ETEC diarrhea is approved in the United States, and cholera vaccines used elsewhere have significant limitations...

..The very recent availability of inexpensive oral cholera vaccines makes this objective even more relevant...

..of transmission of this and perhaps other water-borne pathogens, it will aid in the development of new cholera vaccines that target the antigens of 'incoming' vibrios, and it may suggest new approaches for the prevention of the ..

..of virulence gene expression during infection of an intact host, but will aid in the development of new cholera vaccines and suggest new approaches for the prevention of the dissemination of this lethal organism.

..54 and FlrC-dependent colonization genes and promoters may be useful in the development of live attenuated cholera vaccines, and manipulation of virulence factor repression could have practical applications for anti-cholera therapy.

..intelligently incorporate the participating molecules and any antigenic variants into the design of improved cholera vaccines. Most of this proposal involves a genetic analysis of TCP (toxin regulated pilus) mediated colonization...

..We have also generated new insights into intestinal inflammation caused by these reactogenic cholera vaccines by using gene arrays of epithelial cell transcriptional responses...

..We have also generated new insights into intestinal inflammation caused by these reactogenic cholera vaccines by using gene arrays of epithelial cell transcriptional responses...

..A motivating data set is from a trial of cholera vaccines in Bangladesh...

..A motivating data set is from a trial of cholera vaccines in Bangladesh...

..The development of attenuated cholera vaccines has been plagued by the fact that V...

..Finally, derivatives of 0395-N1 which are suitable for use as a dead, oral cholera vaccines will be constructed which hyperproduce the B subunit of the toxin in both a secreted and nonsecreted form.

..cholerae main virulence factors: cholera toxin and toxin co-regulated in the infant mouse intestine. This knowledge will facilitate the development of improved cholera vaccines.

..cholerae. ..

..We would use data generated through this network in an attempt to estimate national vaccine coverage rates (and other preventative strategies) among international travelers. ..

..difficile toxin A is injected into ligated ileal loops of vaccinated and control animals. ..

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..Protective immunity to V. cholerae is poorly understood, and development of highly effective cholera vaccines has been problematic...

..IVIAT is an established protocol in our laboratory, and this preliminary collaborative study should lay a foundation for subsequent analysis of identified B. anthracis genes and their products. ..