F Qadri

....

..05-0.001). This study thus demonstrates that reduced doses of the ETEC vaccine is immunogenic in children and infants as well as safe in infants down to 6 months of age...

..cholerae O1 and O139...

..Infection with V. parahaemolyticus results in B cell responses and an acute inflammatory response that is self-limiting...

....

..This is being re-evaluated based on available data that natural cholera infection or cholera toxin induces a Th2-type of immune profile and stimulates the humoral immune response, innate cells, and mediators in the host...

..032 to 0.023). Children with ETEC diarrhea were underweight and growth stunted at the 2-year follow-up period, showing the importance of strategies to prevent and decrease ETEC diarrheal morbidity in children...

..Studies are needed to determine if the anti-CS6 responses protect against reinfection and if protective levels of CS6 immunity are induced by vaccination...

..ETEC that produced heat-stable enterotoxin alone was most prevalent, and 78% of strains had colonization factors. Like V. cholerae O1, ETEC can cause epidemic diarrhea...

..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...

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

....

....

..These studies show that longus is prevalent among ETEC in Bangladesh and that longus gives rise to IgA antibody responses in patients...

..This study supports the fact that ETEC is still a major cause of childhood diarrhea in Bangladesh, especially in children up to 3 years of age, and that measures to prevent such infections are needed in developing countries...

..003 to <0.001). This study thus shows that the CF-BS-ETEC vaccine is well tolerated in children, 18-36 months of age and gives rise to significant systemic and mucosal IgA antibody responses...

..Vaccines against O1 and O139 cholera ideally should stimulate antibody subclasses that are likely to offer protection...

..These results show that a single dose of the ETEC vaccine may elicit significant mucosal immune responses in both children and adults residing in an ETEC-endemic country such as Bangladesh...

..In summary, we demonstrated that MSHA is immunogenic, giving rise to both systemic and local antibodies in patients with cholera due to both O1 and O139 serogroups...

..These results suggest that despite having a polysaccharide capsule, V. cholerae O139 induces systemic and intestine-derived ASC responses in peripheral blood comparable to those seen in patients with V. cholerae O1 disease...

..In addition, increased production of proinflammatory mediators in the rectum of patients with severe histology suggested contribution of these molecules to the immunopathogenesis of severe colitis caused by shigellae...

..Studies on bacteria that share somatic antigen with V. cholerae O139 may shed further light on the genesis of V. cholerae O139...

..Three major clonal groups were identified among the ETEC strains in this study, largely based on O-antigenic type, CF expression pattern and toxin profile...

..These findings may explain the basis for the lack of heterologous protection between the two serogroups of V. cholerae. Healthy controls had higher background levels of vibriocidal antibody to V. cholerae O1 than to V. cholerae O139...

..This method will be useful when immunogenically active proteins free from other cellular components are required for studies...

..Neurotransmitters and neuropeptides may play differential roles in invasive and watery diarrhoea...

..cholerae protein antigens. Such memory B cells could mediate anamnestic responses on reexposure to V. cholerae...

..The strains showed multiple and similar antibiotic resistance patterns. This study shows that ETEC is prevalent in surface water sources in Bangladesh suggesting a possible reason for the endemicity of this pathogen in Bangladesh...

..In summary, this study showed the presence of a lytic phage in environmental water that is specific for the CS7 CF of ETEC...

..Further studies are required to assess the epidemic potential of the newly emerged clone of V. cholerae O1 and to understand the mechanism of emergence of new clones of toxigenic V. cholerae...

..Available vaccines provide less protection against cholera than natural infection, particularly in children...

..A birth cohort of 238 children was followed in an urban slum in Dhaka, Bangladesh, to determine incidence, prevalence, and epidemiologic factors related to Helicobacter pylori infection...

..abstract truncated at 250 words)..

..However, if cholera due to strains with increased severity spread to other areas where treatment facilities are limited, there are likely to be many more cholera deaths...

..All the 67 V. cholerae O139 culture-positive stool specimens were positive by PCR, and the remaining specimens, which contained either other recognized enteric pathogens or no pathogens, were all negative by PCR...

..Thus, paediatric patients with shigellosis have reduced and delayed adaptive immune responses compared with adult patients...

..L-isoleucine-supplemented ORS might be beneficial in reducing stool output and ORS intake in children with acute watery diarrhoea. A further study is warranted to substantiate the therapeutic effect of L-isoleucine...

..This sets the ground for testing such vaccines in large field trials in Bangladesh and also demonstrates that addition of other vibrio components to the existing cholera vaccine does not alter the responses to the O1 vaccine components...

..The presence of antigen-specific memory B cells may therefore be a more direct measure of protection than serum antibody responses...

..These results suggest that a cholera vaccine based on the Ogawa serotype needs to be further investigated...

..This study demonstrates that the vaccine is safe and immunogenic in children under 2 years of age and that simple interventions can enhance immune responses in young children...

..We did not observe an association between the IgM memory response to LPS and the vibriocidal titer...

..These results demonstrate that TcpA is immunogenic following natural V. cholerae infection and suggest that immune responses to this antigen should be evaluated for potential protection against subsequent life-threatening illness...

..cholerae O139 strains were shown to be only partially resistant, with most strains showing <40% survival. These findings may explain the relative rarity of V. cholerae O139 bacteremia in cholera caused by this organism...

..Thus, supplementation with zinc improves seroconversion to vibriocidal antibody and, hence, has the potential to improve the efficacy of oral cholera vaccine in children...

..No association between baseline vibriocidal titer and protection from V. cholerae O139 infection was found. Our findings suggest that the vibriocidal antibody is an incomplete predictor of protection from V. cholerae infection...

..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...

..05). Our findings demonstrate alterations in clinical features and phenotypic changes of major bacterial pathogens in the recent Bangladesh flood...

..cholerae antigens may be important for the generation and stability of memory B-cell responses. The T-cell proliferative response to VCC was of a higher magnitude than responses observed to other V. cholerae antigens...

..cholerae O1 infection alone. It is possible that LT or other factors expressed by ETEC may play a role as a mucosal adjuvant in enhancing the immune responses to V. cholerae O1...

..001). Our results thus show that oral cholera vaccination induces a Th1 T-cell response in young children, and that the IFN-gamma as well as the vibriocidal antibody responses can be enhanced by zinc supplementation...

..001). In contrast, we did not find any association between the Lewis blood group phenotype and diarrhea caused by ETEC expressing CS6 or rotavirus...

..All of the El Tor strains of V. cholerae O1 isolated since 2001 produced CT of the classical biotype, while those isolated before 2001 produced CT of the El Tor biotype...

..The results suggest that children with shigellosis have a persistent activation of the innate immune response in the convalescent phase, indicating delayed elimination of Shigella antigens compared to adults...

..Further analysis of human genetic factors that contribute to susceptibility to cholera may be productive...

..Phase III studies are being targeted to determine the protective efficacy of CholeraGarde and for further development of a single-dose vaccine that will protect infants and also other age groups from endemic and epidemic cholera...

..Since MSHA is present in a wide variety of V. cholerae strains and is presumed to express in the environment, diverse filamentous phages using this receptor are likely to contribute significantly to V. cholerae evolution...

..Our results demonstrate that genetically related V. cholerae strains cluster in local outbreaks but also suggest that multiple distinct strains of V. cholerae O1 may circulate simultaneously within a household...

..Increases in antimicrobial resistance will dictate the drugs used for the treatment of traveler's diarrhea. Efforts need to be made to improve our understanding of the worldwide importance of ETEC...

..Salmonella enterica serotype Paratyphi A is a human-restricted cause of paratyphoid fever, accounting for up to a fifth of all cases of enteric fever in Asia...

..To determine whether continuing with zinc supplementation after zinc treatment (ZT) of an acute diarrhoea episode will result in additional clinical benefits beyond ZT alone...

..cholerae as well as the contribution of three type IV pili to the phenotype...

....

..The dipsticks represent the first rapid test which has been successfully used to diagnose cholera from rectal swabs, and this would immensely improve surveillance for cholera, especially in remote settings...

..Increased responses, including complement C3, phagocytic activity, and changes in T cell phenotypes, suggest that zinc administration enhances innate immunity against ETEC infection in children...

..It can be important for use in epidemiological studies, as well as in difficult cases involving fevers of unknown origin...

..Important challenges remain in terms of reaching the poorest families and those living in remote areas of Bangladesh...

..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...

..These findings may explain in part the relatively short-term protection afforded by oral cholera vaccination compared to natural disease...

....

....

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

..Irrespective of ST genotype, the disease symptoms were also similar in both children and travelers...

..The prevalence of longus among ETEC strains in Argentina was comparable to that of colonization factor antigen I (CFA/I), CFA/II, and CFA/IV in other regions of the world...

..Serovar Typhi antigens identified by IVIAT warrant further evaluation for their contributions to pathogenesis, and they may have diagnostic, therapeutic, or preventive uses...

..001). Our results suggest that transcutaneous immunization with TcpA and an immunoadjuvant induces protective anti-TcpA immune responses. Anti-TcpA responses may contribute to an optimal cholera vaccine...

..This work holds promise for the identification of bacterial targets of protective human immune responses and may contribute to the development of a new generation of cholera vaccines...

..Phages with closely related restriction patterns and, in the case of T4-like phages, identical g23 gene sequences were isolated from different patients, suggesting epidemiological links between the patients...

..These data will be correlated with environmental factors, to develop a model for prediction of cholera outbreaks...

..The majority of these changes appear to be attempts of the host to counteract the secretory response. Our results also support the concept that epithelial cells are involved in 5-HT signalling during acute cholera...

..Furthermore, passage through the intestinal tract was necessary to observe this phenotype. Thus, V. cholerae genes expressed prior to exiting the host intestinal tract are advantageous for subsequent life in aquatic environments...

..cholerae. If lytic phage are present, viable counts of V. cholerae drop, stools become DF(-), other microorganisms bloom, and cholera transmission is reduced...

..Our results suggest that transcutaneous immunization with CDA toxoid may be a feasible immunization strategy against C. difficile, an important cause of morbidity and mortality against which current preventative strategies are failing...

..We identified a number of these in vivo expressed proteins as immunogenic during human infection. To our knowledge, this is the first characterization of the proteome of a pathogenic bacteria recovered from a natural host...

..pylori, compared with Swedish volunteers. Increased inflammation is present in the duodenum of Bangladeshi volunteers, maybe as a result of frequent exposure to enteric infections in these individuals...

..Both direct effects of CT on the epithelial cells and changes in the lamina propria cells contribute to this up-regulation...

..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...

..We found that estA and eltB are expressed in the in vivo samples but no significant up-or down regulation of the expression levels of either estA or eltB could be determined in vivo as compared to in vitro...

..These findings provide a more detailed assessment of the transcriptome of V. cholerae in the human host than previous studies of organisms in stool alone and have implications for cholera control and the design of improved vaccines...

..cholerae O139, including CVD 112 and Bengal-15. Live, orally administered, attenuated cholera vaccines are in various stages of development and evaluation...

..Our findings suggest that cholera is the predominant cause of flood-associated diarrheal epidemics in Dhaka, but that other organisms spread by the fecal-oral route also contribute...

..Based on this epidemiologic evidence, we propose a hypothesis for understanding the association between blood group O and the risk of infection with V. cholerae O1 and O139 as well as the risk of developing severe symptoms once infected...

..cholerae O1. This assay will enable easy monitoring of the spread of a new emerging variant of the El Tor biotype of V. cholerae O1...

..cholerae. ..