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Fernandez V, Ahmed SM, Graves MC, Pender MA, Shoemaker H, Birich H, Pupaibool J, Benson LS, Leung DT. Incidence Rate and Risk Factors Associated with Travelers' Diarrhea in International Travelers Departing from Utah, USA. Am J Trop Med Hyg 2022; 107:898-903. [PMID: 35970286 PMCID: PMC9651512 DOI: 10.4269/ajtmh.21-1005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 06/01/2022] [Indexed: 11/07/2022] Open
Abstract
Despite knowledge on the causes and prevention strategies for travelers' diarrhea (TD), it continues to be one of the most common illnesses experienced by U.S. international travelers. However, studies of risk factors associated with TD among U.S. travelers are limited. In this study, we aimed to determine the incidence rate of TD, the proportion of travelers who experience TD, and to identify risk factors associated with TD. In this cross-sectional study, we collected and analyzed data from anonymous posttravel questionnaires submitted by international travelers recruited during their pretravel visit at two travel clinics in Salt Lake City, Utah, from October 2016 to March 2020. Of 571 travelers who completed posttravel surveys, 484 (85%) answered the TD question, of which 111 (23%) reported TD, for an incidence rate of 1.1 episodes per 100 travel-days (95% confidence interval [CI]: 0.9-1.4). In a multivariable model, visiting Southeast Asian (odds ratio [OR]: 2.60; 95% CI: 1.45-4.72) and African (OR: 2.06; 95% CI: 1.09-3.93]) WHO regions, having 10 or more individuals in the group (OR: 3.91; 95% CI: 1.50-11.32]), longer trip duration (OR: 1.01; 95% CI: 1.00-1.02), visiting both urban and rural destinations (OR: 1.94; 95% CI: 1.01-3.90), and taking medications/supplements to prevent TD (OR: 2.74; 95% CI: 1.69-4.47) were statistically significantly associated with increased odds of reporting TD. TD continues to be common in international travelers from the United States. Our findings provide insights regarding travelers' behaviors regarding TD in international travelers from high-income countries and shows the need for additional research into prevention strategies for travelers' diarrhea.
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Affiliation(s)
- Valerie Fernandez
- Division of Infectious Disease, University of Utah School of Medicine, Salt Lake City, Utah
| | - Sharia M. Ahmed
- Division of Infectious Disease, University of Utah School of Medicine, Salt Lake City, Utah
| | - Michael C. Graves
- Division of Infectious Disease, University of Utah School of Medicine, Salt Lake City, Utah
| | - Melissa A. Pender
- Division of Infectious Disease, University of Utah School of Medicine, Salt Lake City, Utah
| | - Holly Shoemaker
- Division of Population Health Sciences, University of Utah School of Medicine, Salt Lake City, Utah
| | - Holly Birich
- Salt Lake County Health Department, Salt Lake City, Utah
| | - Jakrapun Pupaibool
- Division of Infectious Disease, University of Utah School of Medicine, Salt Lake City, Utah
| | - L. Scott Benson
- Division of Public Health, University of Utah School of Medicine, Salt Lake City, Utah
| | - Daniel T. Leung
- Division of Infectious Disease, University of Utah School of Medicine, Salt Lake City, Utah
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Pender MA, Smith T, Brintz BJ, Pandey P, Shrestha SK, Anuras S, Demons S, Sornsakrin S, Bodhidatta L, Platts-Mills JA, Leung DT. Weather variables as important clinical predictors of bacterial diarrhoea among international travellers. J Travel Med 2022; 29:6520888. [PMID: 35134202 PMCID: PMC9282096 DOI: 10.1093/jtm/taac012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 01/19/2022] [Accepted: 01/27/2022] [Indexed: 02/05/2023]
Abstract
BACKGROUND Clinicians and travellers often have limited tools to differentiate bacterial from non-bacterial causes of travellers' diarrhoea (TD). Development of a clinical prediction rule assessing the aetiology of TD may help identify episodes of bacterial diarrhoea and limit inappropriate antibiotic use. We aimed to identify predictors of bacterial diarrhoea among clinical, demographic and weather variables, as well as to develop and cross-validate a parsimonious predictive model. METHODS We collected de-identified clinical data from 457 international travellers with acute diarrhoea presenting to two healthcare centres in Nepal and Thailand. We used conventional microbiologic and multiplex molecular methods to identify diarrheal aetiology from stool samples. We used random forest and logistic regression to determine predictors of bacterial diarrhoea. RESULTS We identified 195 cases of bacterial aetiology, 63 viral, 125 mixed pathogens, 6 protozoal/parasite and 68 cases without a detected pathogen. Random forest regression indicated that the strongest predictors of bacterial over viral or non-detected aetiologies were average location-specific environmental temperature and red blood cell on stool microscopy. In 5-fold cross-validation, the parsimonious model with the highest discriminative performance had an area under the receiver operator curve of 0.73 using 3 variables with calibration intercept -0.01 (standard deviation, SD 0.31) and slope 0.95 (SD 0.36). CONCLUSIONS We identified environmental temperature, a location-specific parameter, as an important predictor of bacterial TD, among traditional patient-specific parameters predictive of aetiology. Future work includes further validation and the development of a clinical decision-support tool to inform appropriate use of antibiotics in TD.
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Affiliation(s)
- Melissa A Pender
- Division of Infectious Diseases, University of Utah School of Medicine, Salt Lake City, UT 84132, USA
| | - Timothy Smith
- Division of Infectious Diseases, University of Utah School of Medicine, Salt Lake City, UT 84132, USA
| | - Ben J Brintz
- Division of Infectious Diseases, University of Utah School of Medicine, Salt Lake City, UT 84132, USA
| | - Prativa Pandey
- CIWEC Hospital Director, CIWEC Hospital, Kathmandu 44600, Nepal
| | - Sanjaya K Shrestha
- Department of Bacterial and Parasitic Diseases, Walter Reed/Armed Forces Research Institute of Medical Sciences Research Unit Nepal (WARUN), Kathmandu 44600, Nepal
| | - Sinn Anuras
- Department of Medicine, MedPark Hospital, Bangkok 10110, Thailand
| | - Samandra Demons
- Department of Bacterial and Parasitic Diseases, Armed Forces Research Institute of Medical Sciences (AFRIMS), Bangkok 10400, Thailand
| | - Siriporn Sornsakrin
- Department of Bacterial and Parasitic Diseases, Armed Forces Research Institute of Medical Sciences (AFRIMS), Bangkok 10400, Thailand
| | - Ladaporn Bodhidatta
- Department of Bacterial and Parasitic Diseases, Armed Forces Research Institute of Medical Sciences (AFRIMS), Bangkok 10400, Thailand
| | - James A Platts-Mills
- Division of Infectious Diseases and International Health, University of Virginia School of Medicine, Charlottesville, VA 22903, USA
| | - Daniel T Leung
- Division of Infectious Diseases, University of Utah School of Medicine, Salt Lake City, UT 84132, USA
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Lόpez-Vélez R, Lebens M, Bundy L, Barriga J, Steffen R. Bacterial travellers' diarrhoea: A narrative review of literature published over the past 10 years. Travel Med Infect Dis 2022; 47:102293. [PMID: 35247581 DOI: 10.1016/j.tmaid.2022.102293] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 02/24/2022] [Accepted: 02/28/2022] [Indexed: 02/04/2023]
Abstract
Travellers' diarrhoea (TD) is the most frequent illness experienced by international travellers to lower-income countries with bacterial agents considered to account for 80-90% of cases. In this review, we summarise evidence published on bacterial TD over the past 10 years, focusing on the epidemiology and aetiology of TD. Diarrhoeagenic Escherichia coli (DEC) continue to be the most commonly implicated bacteria in TD, although Enteropathogenic E. coli (EPEC) and Enteroaggregative E. coli (EAEC) now appear to be predominant where Enterotoxigenic E. coli (ETEC) was previously considered most prevalent globally. Where fluroquinolone resistance had primarily been documented for Campylobacter in Southeast Asia, widespread resistance has been observed in most regions of the world for multiple enteropathogens, including Shigella, Salmonella, ETEC and EAEC. Implementation of novel molecular methods for pathogen detection has led to identification of bacterial pathogens, including Clostridium difficile (with and without the use of prior antibiotics), Arcobacter species and Bacteroides fragilis, as aetiological agents in TD. The widespread resistance to first-line antibiotics in multiple bacterial enteropathogens warrants continued surveillance and re-evaluation of current treatment practices. Further investigations are required to determine the prevalence and geographical distribution of bacterial enteropathogens that have been more recently implicated in TD.
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Affiliation(s)
- Rogelio Lόpez-Vélez
- National Referral Unit for Tropical Diseases, Infectious Diseases Department, Ramón y Cajal University Hospital, IRYCIS, 28034, Madrid, Spain.
| | - Michael Lebens
- Department of Microbiology and Immunology, University of Gothenburg, Box 435, SE-40530, Gothenburg, Sweden.
| | - Leah Bundy
- Elements Communications Ltd, Westerham, TN16 1RQ, UK.
| | - Juan Barriga
- Department of Medical Affairs Europe, Emergent BioSolutions, 1455, Madrid, Spain.
| | - Robert Steffen
- Epidemiology, Biostatistics and Prevention Institute, World Health Organization Collaborating Centre for Travelers' Health, University of Zurich, Hirschengraben 84, CH-8001, Zurich, Switzerland; Epidemiology, Human Genetics and Environmental Sciences Division, University of Texas School of Public Health, Houston, TX 77030, Texas, USA.
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Palit P, Nuzhat S, Khan SS, Gazi MA, Islam MR, Islam MO, Mahfuz M, Liu J, Houpt ER, Haque R, Ahmed T. Use of TaqMan Array Cards to investigate the aetiological agents of diarrhoea among young infants with severe acute malnutrition. Trop Med Int Health 2021; 26:1659-1667. [PMID: 34498343 DOI: 10.1111/tmi.13677] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
OBJECTIVE Studies involving less sensitive conventional microscopy and culture-based approaches have identified distinct differences in diarrhoeal aetiology in childhood malnutrition. Our study involved the use of an advanced molecular biology technique, the TaqMan Array Cards (TAC), to elucidate the diarrhoeal aetiology among young infants with severe acute malnutrition (SAM). METHOD A total of 113 faecal samples was collected from SAM infants, aged 2-6 months, upon admission to the Dhaka Hospital of the International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b) with complications of diarrhoea and related comorbidities. We used TAC for the detection of 29 different diarrhoeal enteropathogens from a single faecal sample. For comparison, we also analysed 25 diarrhoeal samples from well-nourished infants of similar age. RESULTS Higher odds of detection of all bacterial enteropathogens were associated with diarrhoea among SAM infants. In particular, the detection of Aeromonas sp (aOR: 25.7, p = 0.011), Campylobacter sp (aOR: 9.6, p < 0.01) and ETEC (aOR: 5.2, p = 0.022) was significantly associated with diarrhoea among SAM infants in comparison to well-nourished infants. 80% higher odds of detection of rotavirus and norovirus GII were associated with diarrhoea among well-nourished infants in comparison to SAM infants (aOR: 0.2, p < 0.05). CONCLUSION Our study findings demonstrate a difference in diarrhoeal aetiology among SAM and well-nourished young infants, which may be useful in providing an evidence-based logic for possible revision of treatment guidelines for treatment of young diarrhoeal infants with SAM in the early management of the menace of antimicrobial resistance.
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Affiliation(s)
- Parag Palit
- Nutrition and Clinical Services Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Sharika Nuzhat
- Nutrition and Clinical Services Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Shaila Sharmeen Khan
- Emerging Infections and Parasitology Laboratory, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Md Amran Gazi
- Nutrition and Clinical Services Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Md Ridwan Islam
- Nutrition and Clinical Services Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Md Ohedul Islam
- Emerging Infections and Parasitology Laboratory, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Mustafa Mahfuz
- Nutrition and Clinical Services Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh.,Faculty of Medicine and Life Sciences, University of Tampere, Tampere, Finland
| | - Jie Liu
- Division of Infectious Diseases and International Health, University of Virginia, Charlottesville, VA, USA
| | - Eric R Houpt
- Division of Infectious Diseases and International Health, University of Virginia, Charlottesville, VA, USA
| | - Rashidul Haque
- Emerging Infections and Parasitology Laboratory, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
| | - Tahmeed Ahmed
- Nutrition and Clinical Services Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh.,James P. Grant School of Public Health, BRAC University, Dhaka, Bangladesh
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Pedrosa de Macena LDG, Castiglia Feitosa R, Vieira CB, Araújo IT, Taniuchi M, Miagostovich MP. Microbiological assessment of an urban lagoon system in the coastal zone of Rio de Janeiro, Brazil. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:1170-1180. [PMID: 32839906 DOI: 10.1007/s11356-020-10479-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Accepted: 08/10/2020] [Indexed: 06/11/2023]
Abstract
This study aims to assess microbiological contamination using a molecular tool for detection of multiple enteropathogens in a coastal ecosystem area in Rio de Janeiro, Brazil. Ten litres of superficial water samples were obtained during the spring ebb tide from sampling sites along the Jacarepaguá watershed. Samples were concentrated using skimmed milk flocculation method for TaqMan array card (TAC), designed to identify 35 enteric pathogens simultaneously, and single TaqMan qPCR analysis for detecting human adenovirus (HAdV) and JC human polyomavirus (JCPyV) as faecal indicator viruses (FIV). TAC results identified 17 enteric pathogens including 4/5 viral species investigated, 8/15 bacteria, 4/6 protozoa and 1/7 helminths. Escherichia coli concentration was also measured as faecal indicator bacteria (FIB) using Colilert Quanti-Tray System with positivity in all samples studied. HAdV and JCPyV qPCR were detected in 8 and 4 samples, respectively, with concentration ranging from 8 × 102 to 2 × 106 genome copies/L. Partial nucleotide sequencing demonstrated the occurrence of species HAdV A, C, D, and F, present in faeces of individuals with enteric and non-enteric infections, and JCPyV type 3 (Af2), prevalent in a high genetically mixed population like the Brazilian. The diversity of enteropathogens detected by TAC emphasizes the utility of this methodology for quick assessment of microbiological contamination of the aquatic ecosystems, speeding up mitigation actions where the risk of the exposed population is detected, as well as pointing out the infrastructure gaps in areas where accelerated urban growth is observed.
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Affiliation(s)
- Lorena da Graça Pedrosa de Macena
- Laboratory of Comparative and Environmental Virology, Oswaldo Cruz Institute (IOC), Oswaldo Cruz Foundation (FIOCRUZ), Helio e Peggy Pereira Pavilion, Avenida Brasil, 4365, Manguinhos, Rio de Janeiro, RJ, 21040-360, Brazil.
| | - Renato Castiglia Feitosa
- Department of Sanitation and Environmental Health, National School of Public Health (ENSP), Oswaldo Cruz Foundation (FIOCRUZ), Rua Leopoldo Bulhões, 1.480, Manguinhos, Rio de Janeiro, RJ, 21041-210, Brazil
| | - Carmen Baur Vieira
- Department of Microbiology and Parasitology (MIP), Biomedical Institute, Federal Fluminense University (UFF), Rua Professor Hernani Melo, 101, São Domingos, Niterói, RJ, 24210-130, Brazil
| | - Irene Trigueiros Araújo
- Laboratory of Comparative and Environmental Virology, Oswaldo Cruz Institute (IOC), Oswaldo Cruz Foundation (FIOCRUZ), Helio e Peggy Pereira Pavilion, Avenida Brasil, 4365, Manguinhos, Rio de Janeiro, RJ, 21040-360, Brazil
| | - Mami Taniuchi
- Division of Infectious Diseases and International Health, University of Virginia School of Medicine, Charlottesville, Virginia, VA, 22903, USA
| | - Marize Pereira Miagostovich
- Laboratory of Comparative and Environmental Virology, Oswaldo Cruz Institute (IOC), Oswaldo Cruz Foundation (FIOCRUZ), Helio e Peggy Pereira Pavilion, Avenida Brasil, 4365, Manguinhos, Rio de Janeiro, RJ, 21040-360, Brazil
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Rapid detection of enteric pathogens in a medical assistance team by real-time multiplex PCR. Pathology 2020; 53:290-292. [PMID: 32994045 DOI: 10.1016/j.pathol.2020.06.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 06/22/2020] [Accepted: 06/28/2020] [Indexed: 11/21/2022]
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Enteric etiological surveillance in acute diarrhea stool of United States Military Personnel on deployment in Thailand, 2013-2017. Gut Pathog 2020; 12:17. [PMID: 32308742 PMCID: PMC7146992 DOI: 10.1186/s13099-020-00356-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Accepted: 04/04/2020] [Indexed: 12/14/2022] Open
Abstract
Background Diarrhea remains a major public health problem for both civilian and military populations. This study describes the prevalence of acute diarrheal illness etiological agents, their antibiotic resistance distribution patterns, the resulting impact upon military force health protection, and potential prevention and treatment strategies. Results Forty-eight acute diarrhea stool samples from US military personnel deployed to Thailand from 2013–2017 were screened for enteric pathogens using ELISA, the TaqMan Array Card (TAC), and conventional microbiological methods. These isolates were also evaluated using antimicrobial susceptibility testing (AST) against ampicillin (AMP), azithromycin (AZM), ceftriaxone (CRO), ciprofloxacin (CIP), nalidixic acid (NA), erythromycin (ERY), and trimethoprim-sulfamethoxazole (SXT) using commercial methodology. Susceptibility results were interpreted following the CLSI and NARM guidelines. Questionnaire data obtained from 47/48 volunteers indicated that 89.4% (42/47) reported eating local food and the most common clinical symptoms were nausea and abdominal pain (51%; 24/47). Multiple bacterial species were identified from the 48 stool samples with diarrhea etiological agents being detected in 79% (38/48) of the samples distributed as follows: 43.8% (21/48) Campylobacter jejuni and Campylobacter species, 42% (20/48) diarrheagenic Escherichia coli, and 23% (11/48) Salmonella. Co-infections were detected in 46% (22/48) of the samples. All C. jejuni isolates were resistant to CIP and NA. One C. jejuni isolate exhibited resistance to both AZM and ERY. Lastly, an association between exposure to poultry and subsequent detection of the diarrhea-associated pathogens E. coli and P. shigelloides was significant (p < 0.05). Conclusion The detection of Campylobacter isolates with CIP, AZM and ERY resistance has critical force health protection and public health implications, as these data should guide effective Campylobacteriosis treatment options for deployed military members and travelers to Southeast Asia. Additional research efforts are recommended to determine the association of pathogen co-infections and/or other contributing factors towards diarrheal disease in military and traveler populations. Ongoing surveillance and AST profiling of potential disease-causing bacteria is required for effective disease prevention efforts and treatment strategies.
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Lertsethtakarn P, Silapong S, Sakpaisal P, Serichantalergs O, Ruamsap N, Lurchachaiwong W, Anuras S, Platts-Mills JA, Liu J, Houpt ER, Bodhidatta L, Swierczewski BE, Mason CJ. Travelers' Diarrhea in Thailand: A Quantitative Analysis Using TaqMan® Array Card. Clin Infect Dis 2019; 67:120-127. [PMID: 29351583 DOI: 10.1093/cid/ciy040] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 01/16/2018] [Indexed: 12/15/2022] Open
Abstract
Background Travelers' diarrhea (TD) is a common illness experienced by travelers from developed countries who visit developing countries. Recent questionnaire-based surveillance studies showed that approximately 6%-16% of travelers experienced TD while visiting Thailand; however, a majority of TD information was limited mainly to US military populations. Methods A TD surveillance study was conducted at Bumrungrad International Hospital in 2012-2014 in Bangkok, Thailand. Enteropathogens were identified using conventional methods and the TaqMan® array card (TAC), which uses real-time polymerase chain reaction for the simultaneous detection of multiple pathogens. Analyses to determine pathogen-disease and symptoms association were performed to elucidate the clinical relevance of each enteropathogen. Results TAC identified more pathogens per sample than conventional methods. Campylobacter spp. were the most prevalent, followed by the diarrheagenic Escherichia coli and norovirus GII. These agents had significant pathogen-disease associations as well as high attributable fractions among diarrheal cases. A wide range of pathogen loads for Campylobacter spp. was associated with TD, while heat-labile toxin enterotoxigenic Escherichia coli was associated with an increased pathogen load. Most cases were associated with inflammatory diarrhea, while Campylobacter spp. and Shigella spp. were associated with dysentery. Conclusions A pan-molecular diagnostic method such as TAC produces quantifiable and comparable results of all tested pathogens, thereby reducing the variability associated with multiple conventional methods. This allows better determination of the clinical relevance of each diarrhea etiologic agent, as well as their geographical relevance in Thailand.
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Affiliation(s)
- Paphavee Lertsethtakarn
- Department of Enteric Diseases, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
| | - Sasikorn Silapong
- Department of Enteric Diseases, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
| | - Pimmada Sakpaisal
- Department of Enteric Diseases, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
| | - Oralak Serichantalergs
- Department of Enteric Diseases, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
| | - Nattaya Ruamsap
- Department of Enteric Diseases, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
| | - Woradee Lurchachaiwong
- Department of Enteric Diseases, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
| | - Sinn Anuras
- Bumrungrad International Hospital, Bangkok, Thailand
| | - James A Platts-Mills
- Division of Infectious Diseases and International Health, University of Virginia, Charlottesville
| | - Jie Liu
- Division of Infectious Diseases and International Health, University of Virginia, Charlottesville
| | - Eric R Houpt
- Division of Infectious Diseases and International Health, University of Virginia, Charlottesville
| | - Ladaporn Bodhidatta
- Department of Enteric Diseases, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
| | - Brett E Swierczewski
- Department of Enteric Diseases, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
| | - Carl J Mason
- Department of Enteric Diseases, Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand
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