A Phase I trial to evaluate the safety and immunogenicity of WRSs2 and WRSs3; two live oral candidate vaccines against Shigella sonnei

•Shigella is a significant cause of morbidity and mortality among children in the developing world and travelers to endemic areas.•There are no licensed vaccines against Shigella.•The study showed the safety and immunogenicity of two live-attenuated, oral S. sonnei vaccines.•Future research will eva...

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Published inVaccine Vol. 36; no. 32; pp. 4880 - 4889
Main Authors Frenck, Robert W, Baqar, Shahida, Alexander, William, Dickey, Michelle, McNeal, Monica, El-Khorazaty, Jill, Baughman, Holly, Hoeper, Amy, Barnoy, Shoshana, Suvarnapunya, Akamol E., Kaminski, Robert W., Venkatesan, Malabi M.
Format Journal Article
LanguageEnglish
Published Netherlands Elsevier Ltd 06.08.2018
Elsevier Limited
Subjects
Online AccessGet full text
ISSN0264-410X
1873-2518
1873-2518
DOI10.1016/j.vaccine.2018.06.063

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Abstract •Shigella is a significant cause of morbidity and mortality among children in the developing world and travelers to endemic areas.•There are no licensed vaccines against Shigella.•The study showed the safety and immunogenicity of two live-attenuated, oral S. sonnei vaccines.•Future research will evaluate the efficacy of the vaccines against S. sonnei infection in a human challenge model. Effective vaccines are needed to combat diarrheal diseases due to Shigella. Two live oral S. sonnei vaccine candidates, WRSs2 and WRSs3, attenuated principally by the lack of spreading ability, as well as the loss of enterotoxin and acyl transferase genes, were tested for safety and immunogenicity. Healthy adults 18–45 years of age, assigned to 5 cohorts of 18 subjects each (WRSs2 (n = 8), WRSs3 (n = 8) or placebo (n = 2)) were housed in an inpatient facility and administered a single oral dose of study agent 5 min after ingestion of oral bicarbonate. Ascending dosages of vaccine (from 103 CFU to 107 CFU) were evaluated. On day 8, treatment with ciprofloxacin (500 mg BID for 3 days) was initiated and subjects were discharged home 2 days after completing antibiotics. Subjects returned for outpatient visits on day 14, 28 and 56 post-vaccination for monitoring and collection of stool and blood samples. Both WRSs2 and WRSs3 were generally well tolerated and safe over the entire dose range. Among the 80 vaccinees, 11 subjects developed diarrhea, 8 of which were mild and did not affect daily activities. At the 107 CFU dose, moderate diarrhea occurred in one WRSs2 subject while at the same dose of WRSs3, 2 subjects had moderate or severe diarrhea. Vaccinees mounted dose-dependent mucosal and systemic immune responses that appeared to correlate with fecal shedding. S. sonnei vaccine candidates WRSs2 and WRSs3 are safe and immunogenic over a wide dose range. Future steps will be to select the most promising candidate and move to human challenge models for efficacy of the vaccine.
AbstractList Effective vaccines are needed to combat diarrheal diseases due to Shigella. Two live oral S. sonnei vaccine candidates, WRSs2 and WRSs3, attenuated principally by the lack of spreading ability, as well as the loss of enterotoxin and acyl transferase genes, were tested for safety and immunogenicity.Healthy adults 18–45 years of age, assigned to 5 cohorts of 18 subjects each (WRSs2 (n = 8), WRSs3 (n = 8) or placebo (n = 2)) were housed in an inpatient facility and administered a single oral dose of study agent 5 min after ingestion of oral bicarbonate. Ascending dosages of vaccine (from 103 CFU to 107 CFU) were evaluated. On day 8, treatment with ciprofloxacin (500 mg BID for 3 days) was initiated and subjects were discharged home 2 days after completing antibiotics. Subjects returned for outpatient visits on day 14, 28 and 56 post-vaccination for monitoring and collection of stool and blood samples.Both WRSs2 and WRSs3 were generally well tolerated and safe over the entire dose range. Among the 80 vaccinees, 11 subjects developed diarrhea, 8 of which were mild and did not affect daily activities. At the 107 CFU dose, moderate diarrhea occurred in one WRSs2 subject while at the same dose of WRSs3, 2 subjects had moderate or severe diarrhea. Vaccinees mounted dose-dependent mucosal and systemic immune responses that appeared to correlate with fecal shedding.S. sonnei vaccine candidates WRSs2 and WRSs3 are safe and immunogenic over a wide dose range. Future steps will be to select the most promising candidate and move to human challenge models for efficacy of the vaccine.
Effective vaccines are needed to combat diarrheal diseases due to Shigella. Two live oral S. sonnei vaccine candidates, WRSs2 and WRSs3, attenuated principally by the lack of spreading ability, as well as the loss of enterotoxin and acyl transferase genes, were tested for safety and immunogenicity. Healthy adults 18-45 years of age, assigned to 5 cohorts of 18 subjects each (WRSs2 (n = 8), WRSs3 (n = 8) or placebo (n = 2)) were housed in an inpatient facility and administered a single oral dose of study agent 5 min after ingestion of oral bicarbonate. Ascending dosages of vaccine (from 10 CFU to 10 CFU) were evaluated. On day 8, treatment with ciprofloxacin (500 mg BID for 3 days) was initiated and subjects were discharged home 2 days after completing antibiotics. Subjects returned for outpatient visits on day 14, 28 and 56 post-vaccination for monitoring and collection of stool and blood samples. Both WRSs2 and WRSs3 were generally well tolerated and safe over the entire dose range. Among the 80 vaccinees, 11 subjects developed diarrhea, 8 of which were mild and did not affect daily activities. At the 10 CFU dose, moderate diarrhea occurred in one WRSs2 subject while at the same dose of WRSs3, 2 subjects had moderate or severe diarrhea. Vaccinees mounted dose-dependent mucosal and systemic immune responses that appeared to correlate with fecal shedding. S. sonnei vaccine candidates WRSs2 and WRSs3 are safe and immunogenic over a wide dose range. Future steps will be to select the most promising candidate and move to human challenge models for efficacy of the vaccine.
Effective vaccines are needed to combat diarrheal diseases due to Shigella. Two live oral S. sonnei vaccine candidates, WRSs2 and WRSs3, attenuated principally by the lack of spreading ability, as well as the loss of enterotoxin and acyl transferase genes, were tested for safety and immunogenicity.Healthy adults 18–45 years of age, assigned to 5 cohorts of 18 subjects each (WRSs2 (n = 8), WRSs3 (n = 8) or placebo (n = 2)) were housed in an inpatient facility and administered a single oral dose of study agent 5 min after ingestion of oral bicarbonate. Ascending dosages of vaccine (from 10³ CFU to 10⁷ CFU) were evaluated. On day 8, treatment with ciprofloxacin (500 mg BID for 3 days) was initiated and subjects were discharged home 2 days after completing antibiotics. Subjects returned for outpatient visits on day 14, 28 and 56 post-vaccination for monitoring and collection of stool and blood samples.Both WRSs2 and WRSs3 were generally well tolerated and safe over the entire dose range. Among the 80 vaccinees, 11 subjects developed diarrhea, 8 of which were mild and did not affect daily activities. At the 10⁷ CFU dose, moderate diarrhea occurred in one WRSs2 subject while at the same dose of WRSs3, 2 subjects had moderate or severe diarrhea. Vaccinees mounted dose-dependent mucosal and systemic immune responses that appeared to correlate with fecal shedding.S. sonnei vaccine candidates WRSs2 and WRSs3 are safe and immunogenic over a wide dose range. Future steps will be to select the most promising candidate and move to human challenge models for efficacy of the vaccine.
•Shigella is a significant cause of morbidity and mortality among children in the developing world and travelers to endemic areas.•There are no licensed vaccines against Shigella.•The study showed the safety and immunogenicity of two live-attenuated, oral S. sonnei vaccines.•Future research will evaluate the efficacy of the vaccines against S. sonnei infection in a human challenge model. Effective vaccines are needed to combat diarrheal diseases due to Shigella. Two live oral S. sonnei vaccine candidates, WRSs2 and WRSs3, attenuated principally by the lack of spreading ability, as well as the loss of enterotoxin and acyl transferase genes, were tested for safety and immunogenicity. Healthy adults 18–45 years of age, assigned to 5 cohorts of 18 subjects each (WRSs2 (n = 8), WRSs3 (n = 8) or placebo (n = 2)) were housed in an inpatient facility and administered a single oral dose of study agent 5 min after ingestion of oral bicarbonate. Ascending dosages of vaccine (from 103 CFU to 107 CFU) were evaluated. On day 8, treatment with ciprofloxacin (500 mg BID for 3 days) was initiated and subjects were discharged home 2 days after completing antibiotics. Subjects returned for outpatient visits on day 14, 28 and 56 post-vaccination for monitoring and collection of stool and blood samples. Both WRSs2 and WRSs3 were generally well tolerated and safe over the entire dose range. Among the 80 vaccinees, 11 subjects developed diarrhea, 8 of which were mild and did not affect daily activities. At the 107 CFU dose, moderate diarrhea occurred in one WRSs2 subject while at the same dose of WRSs3, 2 subjects had moderate or severe diarrhea. Vaccinees mounted dose-dependent mucosal and systemic immune responses that appeared to correlate with fecal shedding. S. sonnei vaccine candidates WRSs2 and WRSs3 are safe and immunogenic over a wide dose range. Future steps will be to select the most promising candidate and move to human challenge models for efficacy of the vaccine.
Highlights•Shigella is a significant cause of morbidity and mortality among children in the developing world and travelers to endemic areas. •There are no licensed vaccines against Shigella. •The study showed the safety and immunogenicity of two live-attenuated, oral S. sonnei vaccines. •Future research will evaluate the efficacy of the vaccines against S. sonnei infection in a human challenge model.
Effective vaccines are needed to combat diarrheal diseases due to Shigella. Two live oral S. sonnei vaccine candidates, WRSs2 and WRSs3, attenuated principally by the lack of spreading ability, as well as the loss of enterotoxin and acyl transferase genes, were tested for safety and immunogenicity. Healthy adults 18-45 years of age, assigned to 5 cohorts of 18 subjects each (WRSs2 (n = 8), WRSs3 (n = 8) or placebo (n = 2)) were housed in an inpatient facility and administered a single oral dose of study agent 5 min after ingestion of oral bicarbonate. Ascending dosages of vaccine (from 103 CFU to 107 CFU) were evaluated. On day 8, treatment with ciprofloxacin (500 mg BID for 3 days) was initiated and subjects were discharged home 2 days after completing antibiotics. Subjects returned for outpatient visits on day 14, 28 and 56 post-vaccination for monitoring and collection of stool and blood samples. Both WRSs2 and WRSs3 were generally well tolerated and safe over the entire dose range. Among the 80 vaccinees, 11 subjects developed diarrhea, 8 of which were mild and did not affect daily activities. At the 107 CFU dose, moderate diarrhea occurred in one WRSs2 subject while at the same dose of WRSs3, 2 subjects had moderate or severe diarrhea. Vaccinees mounted dose-dependent mucosal and systemic immune responses that appeared to correlate with fecal shedding. S. sonnei vaccine candidates WRSs2 and WRSs3 are safe and immunogenic over a wide dose range. Future steps will be to select the most promising candidate and move to human challenge models for efficacy of the vaccine.Effective vaccines are needed to combat diarrheal diseases due to Shigella. Two live oral S. sonnei vaccine candidates, WRSs2 and WRSs3, attenuated principally by the lack of spreading ability, as well as the loss of enterotoxin and acyl transferase genes, were tested for safety and immunogenicity. Healthy adults 18-45 years of age, assigned to 5 cohorts of 18 subjects each (WRSs2 (n = 8), WRSs3 (n = 8) or placebo (n = 2)) were housed in an inpatient facility and administered a single oral dose of study agent 5 min after ingestion of oral bicarbonate. Ascending dosages of vaccine (from 103 CFU to 107 CFU) were evaluated. On day 8, treatment with ciprofloxacin (500 mg BID for 3 days) was initiated and subjects were discharged home 2 days after completing antibiotics. Subjects returned for outpatient visits on day 14, 28 and 56 post-vaccination for monitoring and collection of stool and blood samples. Both WRSs2 and WRSs3 were generally well tolerated and safe over the entire dose range. Among the 80 vaccinees, 11 subjects developed diarrhea, 8 of which were mild and did not affect daily activities. At the 107 CFU dose, moderate diarrhea occurred in one WRSs2 subject while at the same dose of WRSs3, 2 subjects had moderate or severe diarrhea. Vaccinees mounted dose-dependent mucosal and systemic immune responses that appeared to correlate with fecal shedding. S. sonnei vaccine candidates WRSs2 and WRSs3 are safe and immunogenic over a wide dose range. Future steps will be to select the most promising candidate and move to human challenge models for efficacy of the vaccine.
Effective vaccines are needed to combat diarrheal diseases due to Shigella . Two live oral S. sonnei vaccine candidates, WRSs2 and WRSs3, attenuated principally by the lack of spreading ability, as well as the loss of enterotoxin and acyl transferase genes, were tested for safety and immunogenicity. Healthy adults 18–45 years of age, assigned to 5 cohorts of 18 subjects each (WRSs2 (n = 8), WRSs3 (n = 8) or placebo (n = 2)) were housed in an inpatient facility and administered a single oral dose of study agent 5 min after ingestion of oral bicarbonate. Ascending dosages of vaccine (from 10 3 CFU to 10 7 CFU) were evaluated. On day 8, treatment with ciprofloxacin (500 mg BID for 3 days) was initiated and subjects were discharged home 2 days after completing antibiotics. Subjects returned for outpatient visits on day 14, 28 and 56 post-vaccination for monitoring and collection of stool and blood samples. Both WRSs2 and WRSs3 were generally well tolerated and safe over the entire dose range. Among the 80 vaccinees, 11 subjects developed diarrhea, 8 of which were mild and did not affect daily activities. At the 10 7 CFU dose, moderate diarrhea occurred in one WRSs2 subject while at the same dose of WRSs3, 2 subjects had moderate or severe diarrhea. Vaccinees mounted dose-dependent mucosal and systemic immune responses that appeared to correlate with fecal shedding. S. sonnei vaccine candidates WRSs2 and WRSs3 are safe and immunogenic over a wide dose range. Future steps will be to select the most promising candidate and move to human challenge models for efficacy of the vaccine.
Author Baughman, Holly
El-Khorazaty, Jill
Suvarnapunya, Akamol E.
Baqar, Shahida
Alexander, William
Dickey, Michelle
McNeal, Monica
Kaminski, Robert W.
Frenck, Robert W
Barnoy, Shoshana
Hoeper, Amy
Venkatesan, Malabi M.
AuthorAffiliation a Cincinnati Children’s Hospital Medical Center, Cincinnati, OH, United States
b Division of Microbiology and Infectious Diseases, National Institute of Allergy and Infectious Diseases, Bethesda, MD, United States
c The Emmes Corporation, Rockville, MD, USA
d Department of Enteric Infections, Bacterial Diseases Branch, Walter Reed Army Institute of Research, Silver Spring, MD, United States
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Issue 32
Keywords Phase I study
Shigella sonnei
WRSs2/3
Live vaccines
Language English
License Copyright © 2018 Elsevier Ltd. All rights reserved.
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  ident: 10.1016/j.vaccine.2018.06.063_b0070
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  publication-title: Vaccine
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  article-title: Evaluation of virulent and live Shigella sonnei vaccine candidates in a gnotobiotic piglet model
  publication-title: Vaccine
  doi: 10.1016/j.vaccine.2013.04.076
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Snippet •Shigella is a significant cause of morbidity and mortality among children in the developing world and travelers to endemic areas.•There are no licensed...
Highlights•Shigella is a significant cause of morbidity and mortality among children in the developing world and travelers to endemic areas. •There are no...
Effective vaccines are needed to combat diarrheal diseases due to Shigella. Two live oral S. sonnei vaccine candidates, WRSs2 and WRSs3, attenuated principally...
Effective vaccines are needed to combat diarrheal diseases due to Shigella . Two live oral S. sonnei vaccine candidates, WRSs2 and WRSs3, attenuated...
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StartPage 4880
SubjectTerms Administration, Oral
Adolescent
Adult
Adults
Allergy and Immunology
Antibiotics
Bacterial Proteins - immunology
Bicarbonates
blood
Candidates
Ciprofloxacin
Diarrhea
dose response
enterotoxins
Enzyme-Linked Immunosorbent Assay
Feces
genes
Humans
Immune response
Immunization
Immunogenicity
Infections
Ingestion
Live vaccines
Middle Aged
monitoring
Mucosal immunity
oral administration
Phase I study
placebos
Safety
Shigella
Shigella sonnei
Shigella sonnei - immunology
Shigella sonnei - pathogenicity
Shigella Vaccines - administration & dosage
Shigella Vaccines - immunology
Shigella Vaccines - therapeutic use
transferases
Urine
Vaccines
Vaccines, Attenuated - administration & dosage
Vaccines, Attenuated - immunology
Vaccines, Attenuated - therapeutic use
WRSs2/3
Young Adult
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Title A Phase I trial to evaluate the safety and immunogenicity of WRSs2 and WRSs3; two live oral candidate vaccines against Shigella sonnei
URI https://www.clinicalkey.com/#!/content/1-s2.0-S0264410X18309046
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https://dx.doi.org/10.1016/j.vaccine.2018.06.063
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Volume 36
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