Now showing items 1-20 of 21

    • Antibody Secreting Cell Responses following Vaccination with Bivalent Oral Cholera Vaccine among Haitian Adults 

      Matias, Wilfredo R.; Falkard, Brie; Charles, Richelle C.; Mayo-Smith, Leslie M.; Teng, Jessica E.; Xu, Peng; Kováč, Pavol; Ryan, Edward T.; Qadri, Firdausi; Franke, Molly F.; Ivers, Louise C.; Harris, Jason B. (Public Library of Science, 2016)
      Background: The bivalent whole-cell (BivWC) oral cholera vaccine (Shanchol) is effective in preventing cholera. However, evaluations of immune responses following vaccination with BivWC have been limited. To determine ...
    • Antigen-Specific Memory B-cell Responses to Enterotoxigenic Escherichia coli Infection in Bangladeshi Adults 

      Alam, Mohammad Murshid; Aktar, Amena; Afrin, Sadia; Rahman, Mohammad Arif; Aktar, Sarmin; Uddin, Taher; Rahman, M. Arifur; Mahbuba, Deena Al; Chowdhury, Fahima; Khan, Ashraful Islam; Bhuiyan, Taufiqur Rahman; Begum, Yasmin Ara; Ryan, Edward T.; Calderwood, Stephen B.; Svennerholm, Ann-Mari; Qadri, Firdausi (Public Library of Science, 2014)
      Background: Multiple infections with diverse enterotoxigenic E. coli (ETEC) strains lead to broad spectrum protection against ETEC diarrhea. However, the precise mechanism of protection against ETEC infection is still ...
    • Biomarkers of Environmental Enteropathy are Positively Associated with Immune Responses to an Oral Cholera Vaccine in Bangladeshi Children 

      Uddin, Muhammad Ikhtear; Islam, Shahidul; Nishat, Naoshin S.; Hossain, Motaher; Rafique, Tanzeem Ahmed; Rashu, Rasheduzzaman; Hoq, Mohammad Rubel; Zhang, Yue; Saha, Amit; Harris, Jason B.; Calderwood, Stephen B.; Bhuiyan, Taufiqur Rahman; Ryan, Edward T.; Leung, Daniel T.; Qadri, Firdausi (Public Library of Science, 2016)
      Environmental enteropathy (EE) is a poorly understood condition that refers to chronic alterations in intestinal permeability, absorption, and inflammation, which mainly affects young children in resource-limited settings. ...
    • Cellular and Cytokine Responses to Salmonella enterica Serotype Typhi Proteins in Patients with Typhoid Fever in Bangladesh 

      Bhuiyan, Saruar; Sayeed, Abu; Khanam, Farhana; Leung, Daniel T.; Rahman Bhuiyan, Taufiqur; Sheikh, Alaullah; Salma, Umme; LaRocque, Regina C.; Harris, Jason B.; Pacek, Marcin; Calderwood, Stephen B.; LaBaer, Joshua; Ryan, Edward T.; Qadri, Firdausi; Charles, Richelle C. (The American Society of Tropical Medicine and Hygiene, 2014)
      We assessed interferon-gamma (IFN-γ) responses via enzyme-linked immunosorbent spot (ELISPOT) to a number of S. Typhi antigens in samples from humans with S. Typhi bacteremia and typhoid fever in Bangladesh. Compared with ...
    • Chemoproteomic profiling of host and pathogen enzymes active in cholera 

      Hatzios, Stavroula K.; Abel, Sören; Martell, Julianne; Hubbard, Troy; Sasabe, Jumpei; Munera, Diana; Clark, Lars; Bachovchin, Daniel A.; Qadri, Firdausi; Ryan, Edward T.; Davis, Brigid M.; Weerapana, Eranthie; Waldor, Matthew K. (2016)
      Activity-based protein profiling (ABPP) is a chemoproteomic tool for detecting active enzymes in complex biological systems. We used ABPP to identify secreted bacterial and host serine hydrolases that are active in animals ...
    • A Cholera Conjugate Vaccine Containing O-specific Polysaccharide (OSP) of V. cholerae O1 Inaba and Recombinant Fragment of Tetanus Toxin Heavy Chain (OSP:rTTHc) Induces Serum, Memory and Lamina Proprial Responses against OSP and Is Protective in Mice 

      Sayeed, Md. Abu; Bufano, Meagan Kelly; Xu, Peng; Eckhoff, Grace; Charles, Richelle C.; Alam, Mohammad Murshid; Sultana, Tania; Rashu, Md. Rasheduzzaman; Berger, Amanda; Gonzalez-Escobedo, Geoffrey; Mandlik, Anjali; Bhuiyan, Taufiqur Rahman; Leung, Daniel T.; LaRocque, Regina C.; Harris, Jason B.; Calderwood, Stephen B.; Qadri, Firdausi; Vann, W. F.; Kováč, Pavol; Ryan, Edward T. (Public Library of Science, 2015)
      Background: Vibrio cholerae is the cause of cholera, a severe watery diarrhea. Protection against cholera is serogroup specific. Serogroup specificity is defined by the O-specific polysaccharide (OSP) component of ...
    • Circulating Mucosal Associated Invariant T Cells Are Activated in Vibrio cholerae O1 Infection and Associated with Lipopolysaccharide Antibody Responses 

      Leung, Daniel T.; Bhuiyan, Taufiqur R.; Nishat, Naoshin S.; Hoq, Mohammad Rubel; Aktar, Amena; Rahman, M. Arifur; Uddin, Taher; Khan, Ashraful I.; Chowdhury, Fahima; Charles, Richelle C.; Harris, Jason B.; Calderwood, Stephen B.; Qadri, Firdausi; Ryan, Edward T. (Public Library of Science, 2014)
      Background: Mucosal Associated Invariant T (MAIT) cells are innate-like T cells found in abundance in the intestinal mucosa, and are thought to play a role in bridging the innate-adaptive interface. Methods: We measured ...
    • Comparison of the Performance of the TPTest, Tubex, Typhidot and Widal Immunodiagnostic Assays and Blood Cultures in Detecting Patients with Typhoid Fever in Bangladesh, Including Using a Bayesian Latent Class Modeling Approach 

      Islam, Kamrul; Sayeed, Md. Abu; Hossen, Emran; Khanam, Farhana; Charles, Richelle C.; Andrews, Jason; Ryan, Edward T.; Qadri, Firdausi (Public Library of Science, 2016)
      Background: There is an urgent need for an improved diagnostic assay for typhoid fever. In this current study, we compared the recently developed TPTest (Typhoid and Paratyphoid Test) with the Widal test, blood culture, ...
    • Evaluation in Mice of a Conjugate Vaccine for Cholera Made from Vibrio cholerae O1 (Ogawa) O-Specific Polysaccharide 

      Alam, Mohammad Murshid; Bufano, Megan Kelly; Xu, Peng; Kalsy, Anuj; Yu, Y.; Freeman, Y. Wu; Sultana, Tania; Rashu, Md. Rasheduzzaman; Desai, Ishaan; Eckhoff, Grace; Leung, Daniel T.; Charles, Richelle C.; LaRocque, Regina C.; Harris, Jason B.; Clements, John D.; Calderwood, Stephen B.; Qadri, Firdausi; Vann, W. F.; Kováč, Pavol; Ryan, Edward T. (Public Library of Science, 2014)
      Background: Protective immunity against cholera is serogroup specific. Serogroup specificity in Vibrio cholerae is determined by the O-specific polysaccharide (OSP) of lipopolysaccharide (LPS). Generally, polysaccharides ...
    • Evaluation of a Typhoid/Paratyphoid Diagnostic Assay (TPTest) Detecting Anti-Salmonella IgA in Secretions of Peripheral Blood Lymphocytes in Patients in Dhaka, Bangladesh 

      Khanam, Farhana; Sheikh, Alaullah; Sayeed, Md. Abu; Bhuiyan, Md. Saruar; Choudhury, Feroza Kaneez; Salma, Umme; Pervin, Shahnaz; Sultana, Tania; Ahmed, Dilruba; Goswami, Doli; Hossain, Md. Lokman; Mamun, K. Z.; Charles, Richelle C.; Brooks, W. Abdullah; Calderwood, Stephen B.; Cravioto, Alejandro; Ryan, Edward T.; Qadri, Firdausi (Public Library of Science, 2013)
      Background: Rapid and reliable diagnostic assays for enteric (typhoid and paratyphoid) fever are urgently needed. We report the characterization of novel approach utilizing lymphocyte secretions, for diagnosing patients ...
    • Factors Associated with Non-typhoidal Salmonella Bacteremia versus Typhoidal Salmonella Bacteremia in Patients Presenting for Care in an Urban Diarrheal Disease Hospital in Bangladesh 

      Shahunja, K. M.; Leung, Daniel T.; Ahmed, Tahmeed; Bardhan, Pradip Kumar; Ahmed, Dilruba; Qadri, Firdausi; Ryan, Edward T.; Chisti, Mohammod Jobayer (Public Library of Science, 2015)
      Background: Non-typhoidal Salmonella (NTS) and Salmonella enterica serovar Typhi bacteremia are the causes of significant morbidity and mortality worldwide. There is a paucity of data regarding NTS bacteremia in South Asia, ...
    • High Depth, Whole-Genome Sequencing of Cholera Isolates from Haiti and the Dominican Republic 

      Sealfon, Rachel; Gire, Stephen; Ellis, Crystal Nicole; Calderwood, Stephen Beaven; Qadri, Firdausi; Hensley, Lisa; Kellis, Manolis; Ryan, Edward Thomas; Larocque, Regina Celes; Harris, Jason B.; Sabeti, Pardis Christine (BioMed Central, 2012)
      Background: Whole-genome sequencing is an important tool for understanding microbial evolution and identifying the emergence of functionally important variants over the course of epidemics. In October 2010, a severe cholera ...
    • Household Transmission of Vibrio cholerae in Bangladesh 

      Sugimoto, Jonathan D.; Koepke, Amanda A.; Kenah, Eben E.; Halloran, M. Elizabeth; Chowdhury, Fahima; Khan, Ashraful I.; LaRocque, Regina C.; Yang, Yang; Ryan, Edward T.; Qadri, Firdausi; Calderwood, Stephen B.; Harris, Jason B.; Longini, Ira M. (Public Library of Science, 2014)
      Background: Vibrio cholerae infections cluster in households. This study's objective was to quantify the relative contribution of direct, within-household exposure (for example, via contamination of household food, water, ...
    • Identification of Immunogenic Salmonella enterica Serotype Typhi Antigens Expressed in Chronic Biliary Carriers of S. Typhi in Kathmandu, Nepal 

      Charles, Richelle C.; Sultana, Tania; Alam, Mohammad Murshid; Yu, Yanan; Wu-Freeman, Ying; Bufano, Meagan Kelly; Rollins, Sean M.; Tsai, Lillian; Harris, Jason B.; LaRocque, Regina C.; Leung, Daniel T.; Brooks, W. Abdullah; Nga, Tran Vu Thieu; Dongol, Sabina; Basnyat, Buddha; Calderwood, Stephen B.; Farrar, Jeremy; Khanam, Farhana; Gunn, John S.; Qadri, Firdausi; Baker, Stephen; Ryan, Edward T. (Public Library of Science, 2013)
      Background: Salmonella enterica serotype Typhi can colonize and persist in the biliary tract of infected individuals, resulting in a state of asymptomatic chronic carriage. Chronic carriers may act as persistent reservoirs ...
    • Immunogenicity of a Killed Bivalent (O1 and O139) Whole Cell Oral Cholera Vaccine, Shanchol, in Haiti 

      Charles, Richelle C.; Hilaire, Isabelle J.; Mayo-Smith, Leslie M.; Teng, Jessica E.; Jerome, J. Gregory; Franke, Molly F.; Saha, Amit; Yu, Yanan; Kováč, Paul; Calderwood, Stephen B.; Ryan, Edward T.; LaRocque, Regina C.; Almazor, Charles P.; Qadri, Firdausi; Ivers, Louise C.; Harris, Jason B. (Public Library of Science, 2014)
      Background: Studies of the immunogenicity of the killed bivalent whole cell oral cholera vaccine, Shanchol, have been performed in historically cholera-endemic areas of Asia. There is a need to assess the immunogenicity ...
    • A magneto-DNA nanoparticle system for the rapid and sensitive diagnosis of enteric fever 

      Park, Ki Soo; Chung, Hyun Jung; Khanam, Farhana; Lee, Hakho; Rashu, Rasheduzzaman; Bhuiyan, Md. Taufiqur; Berger, Amanda; Harris, Jason B.; Calderwood, Stephen B.; Ryan, Edward T.; Qadri, Firdausi; Weissleder, Ralph; Charles, Richelle C. (Nature Publishing Group, 2016)
      There is currently no widely available optimal assay for diagnosing patients with enteric fever. Here we present a novel assay designed to detect amplified Salmonella nucleic acid (mRNA) using magneto-DNA probes and a ...
    • Plasma Leptin Levels in Children Hospitalized with Cholera in Bangladesh 

      Falkard, Brie; Uddin, Taher; Arifur Rahman, M.; Franke, Molly F.; Aktar, Amena; Uddin, Muhammad Ikhtear; Bhuiyan, Taufiqur Rahman; Leung, Daniel T.; Charles, Richelle C.; Larocque, Regina C.; Harris, Jason B.; Calderwood, Stephen B.; Qadri, Firdausi; Ryan, Edward T. (The American Society of Tropical Medicine and Hygiene, 2015)
      Vibrio cholerae, the cause of cholera, induces both innate and adaptive immune responses in infected humans. Leptin is a hormone that plays a role in both metabolism and mediating immune responses. We characterized leptin ...
    • Single-Cell Analysis of the Plasmablast Response to Vibrio cholerae Demonstrates Expansion of Cross-Reactive Memory B Cells 

      Kauffman, Robert C.; Bhuiyan, Taufiqur R.; Nakajima, Rie; Mayo-Smith, Leslie M.; Rashu, Rasheduzzaman; Hoq, Mohammad Rubel; Chowdhury, Fahima; Khan, Ashraful Islam; Rahman, Atiqur; Bhaumik, Siddhartha K.; Harris, Levelle; O'Neal, Justin T.; Trost, Jessica F.; Alam, Nur Haq; Jasinskas, Algis; Dotsey, Emmanuel; Kelly, Meagan; Charles, Richelle C.; Xu, Peng; Kováč, Pavol; Calderwood, Stephen B.; Ryan, Edward T.; Felgner, Phillip L.; Qadri, Firdausi; Wrammert, Jens; Harris, Jason B. (American Society for Microbiology, 2016)
      ABSTRACT We characterized the acute B cell response in adults with cholera by analyzing the repertoire, specificity, and functional characteristics of 138 monoclonal antibodies (MAbs) generated from single-cell-sorted ...
    • Typhoid Fever in Young Children in Bangladesh: Clinical Findings, Antibiotic Susceptibility Pattern and Immune Responses 

      Khanam, Farhana; Sayeed, Md. Abu; Choudhury, Feroza Kaneez; Sheikh, Alaullah; Ahmed, Dilruba; Goswami, Doli; Hossain, Md. Lokman; Brooks, Abdullah; Calderwood, Stephen B.; Charles, Richelle C.; Cravioto, Alejandro; Ryan, Edward T.; Qadri, Firdausi (Public Library of Science, 2015)
      Background: Children bear a large burden of typhoid fever caused by Salmonella enterica serotype Typhi (S. Typhi) in endemic areas. However, immune responses and clinical findings in children are not well defined. Here, ...
    • A variant in long palate, lung and nasal epithelium clone 1 is associated with cholera in a Bangladeshi population 

      Larocque, Regina Celes; Sabeti, Pardis Christine; Duggal, Priya; Chowdhury, Fahima; Khan, Ashraful I.; Lebrun, Lauren M.; Harris, Jason B.; Ryan, Edward Thomas; Qadri, Firdausi; Calderwood, Stephen Beaven (Nature Publishing Group, 2009)
      Vibrio cholerae causes a dehydrating diarrheal illness that can be rapidly fatal in the absence of specific treatment. The organism is an historic scourge and, like similar infectious diseases, may have influenced the ...