Browsing by Author "Ryan, Edward"

Now showing items 1-20 of 42

    • Analysis of Salmonella enterica Serotype Paratyphi A Gene Expression in the Blood of Bacteremic Patients in Bangladesh 

      Sheikh, Alaullah; Bhuiyan, Md. Saruar; Khanam, Farhana; Bukka, Archana; Kalsy, Anuj; Porwollik, Steffen; Cravioto, Alejandro; Logvinenko, Tanya; McClelland, Michael; Graham, James E.; Qadri, Firdausi; Charles, Richelle Candice; Rollins, Sean McKenzie; Harris, Jason B.; Brooks, W. Abdullah; Larocque, Regina Celes; Hohmann, Elizabeth Louise; Calderwood, Stephen Beaven; Ryan, Edward Thomas (Public Library of Science, 2010)
      Background: 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. Methodology/Principal Findings: In this work, we ...

    • 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 ...

    • Application of In Vivo Induced Antigen Technology (IVIAT) to Bacillus anthracis 

      Peppercorn, Amanda; Young, John S.; Drysdale, Melissa; Baresch, Andrea; Bikowski, Margaret V.; Ashford, David A.; Quinn, Conrad P.; Handfield, Martin; Hillman, Jeffrey D.; Lyons, C. Rick; Koehler, Theresa M.; Sonenshein, Abraham L.; Rollins, Sean McKenzie; Calderwood, Stephen Beaven; Ryan, Edward Thomas (Public Library of Science, 2008)
      In vivo induced antigen technology (IVIAT) is an immuno-screening technique that identifies bacterial antigens expressed during infection and not during standard in vitro culturing conditions. We applied IVIAT to Bacillus ...

    • 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 ...

    • Comparative Proteomic Analysis of the PhoP Regulon in Salmonella enterica Serovar Typhi Versus Typhimurium 

      Lebrun, Lauren M.; Sheikh, Alaullah; Logvinenko, Tanya; Tarique, Abdullah; Krastins, Bryan; Qadri, Firdausi; Charles, Richelle Candice; Harris, Jason B.; Chase, Michael Richard; Larocque, Regina Celes; Rollins, Sean McKenzie; Hohmann, Elizabeth Louise; Rosenberg, Ian Morley; Sarracino, David A.; Calderwood, Stephen Beaven; Ryan, Edward Thomas (Public Library of Science, 2009)
      Background: S. Typhi, a human-restricted Salmonella enterica serovar, causes a systemic intracellular infection in humans (typhoid fever). In comparison, S. Typhimurium causes gastroenteritis in humans, but causes a systemic ...

    • 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, ...

    • Economics of Malaria Prevention in US Travelers to West Africa 

      Adachi, Kenji; Coleman, Margaret S.; Khan, Nomana; Jentes, Emily S.; Arguin, Paul; Rao, Sowmya R.; LaRocque, Regina C.; Sotir, Mark J.; Brunette, Gary; Ryan, Edward T.; Meltzer, Martin I. (Oxford University Press, 2013)
      Background. Pretravel health consultations help international travelers manage travel-related illness risks through education, vaccination, and medication. This study evaluated costs and benefits of that portion of the ...

    • 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 ...

    • Evaluation of an Electricity-free, Culture-based Approach for Detecting Typhoidal Salmonella Bacteremia during Enteric Fever in a High Burden, Resource-limited Setting 

      Andrews, Jason R.; Prajapati, Krishna G.; Eypper, Elizabeth; Shrestha, Poojan; Shakya, Mila; Pathak, Kamal R.; Joshi, Niva; Tiwari, Priyanka; Risal, Manisha; Koirala, Samir; Karkey, Abhilasha; Dongol, Sabina; Wen, Shawn; Smith, Amy B.; Maru, Duncan; Basnyat, Buddha; Baker, Stephen; Farrar, Jeremy; Ryan, Edward T.; Hohmann, Elizabeth; Arjyal, Amit (Public Library of Science, 2013)
      Background: In many rural areas at risk for enteric fever, there are few data on Salmonella enterica serotypes Typhi (S. Typhi) and Paratyphi (S. Paratyphi) incidence, due to limited laboratory capacity for microbiologic ...

    • 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 ...

    • Immunocompromised Travelers: Demographic Characteristics, Travel Destinations, and Pretravel Health Care from the U.S. Global TravEpiNet Consortium 

      Schwartz, Brian S.; Rosen, Jessica; Han, Pauline V.; Hynes, Noreen A.; Hagmann, Stefan H.; Rao, Sowmya R.; Jentes, Emily S.; Ryan, Edward T.; LaRocque, Regina C. (The American Society of Tropical Medicine and Hygiene, 2015)
      An increasing number of immunocompromised individuals are pursuing international travel, and a better understanding of their international travel patterns and pretravel health care is needed. We evaluated the clinical ...