Trial reportClinical infectious diseases : an official publication of the Infectious Diseases Society of America2019
The Effect of Preexisting Immunity on Virus Detection and Immune Responses in a Phase II, Randomized Trial of a Russian-Backbone, Live, Attenuated Influenza Vaccine in Bangladeshi Children.
Trial report in Clinical infectious diseases : an official publication of the Infectious Diseases Society of America, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT01625689 (Assessment of the Safety and Immunogenicity of a Single Dose of Intranasal Seasonal Trivalent Live-Attenuated Influenza Vaccine Among Children Aged 24 Through 59 Months in Bangladesh), which is not on this map. Cited by 19 papers.
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The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Assessment of the Safety and Immunogenicity of a Single Dose of Intranasal Seasonal Trivalent Live-Attenuated Influenza Vaccine Among Children Aged 24 Through 59 Months in Bangladesh
Who cites it
19 citing papers in PubMed.
- Hemagglutination-Inhibition Antibodies and Protection against Influenza Elicited by Inactivated and Live Attenuated Vaccines in Children.The Journal of infectious diseases · 2025Trial
- A Randomized Controlled Trial to Compare Immunogenicity to Cell-Based Versus Live-Attenuated Influenza Vaccines in Children.Journal of the Pediatric Infectious Diseases Society · 2023Trial
- Nasal shedding of vaccine viruses after immunization with a Russian-backbone live attenuated influenza vaccine in India.Influenza and other respiratory viruses · 2023Trial
- Trial
- Influenza A and B Viral Shedding in Adults Immunized With Live Attenuated Influenza Vaccine.Clinical infectious diseases : an official publication of the Infectious Diseases Society of America · 2026Article
- Population Immunity to Influenza Neuraminidase: From Immune Imprinting to Pandemic Preparedness.Vaccines · 2026Review
- Live Attenuated Influenza Virus as a Vector for Multivalent T-Cell Vaccines: Targeting RSV, hMPV, and PIV3.Vaccines · 2026Article
- Intranasal Vaccine Adjuvants and Delivery Platforms: From Barrier Mechanisms to Clinical Translation.Vaccines · 2026Review
- Review
- Live Attenuated Cold-Adapted Influenza Vaccines.Cold Spring Harbor perspectives in medicine · 2021Review
- Antibody Responsiveness to Influenza: What Drives It?Viruses · 2021Review
- Respiratory and Intramuscular Immunization With ChAdOx2-NPM1-NA Induces Distinct Immune Responses in H1N1pdm09 Pre-Exposed Pigs.Frontiers in immunology · 2021Article
- Impact of Pre-Existing Immunity to Influenza on Live-Attenuated Influenza Vaccine (LAIV) Immunogenicity.Vaccines · 2020Article
- Article
- Impact of Pre-Existing Immunity on Live Attenuated Influenza Vaccine-Induced Cross-Protective Immunity.Vaccines · 2020Article
- Review
- Reply to Lindsey, Höschler, and de Silva.Clinical infectious diseases : an official publication of the Infectious Diseases Society of America · 2020Article
- Comparative Immunogenicity of the 2014-2015 Northern Hemisphere Trivalent IIV and LAIV against Influenza A Viruses in Children.Vaccines · 2019Article
- Intestinal antibody responses to a live oral poliovirus vaccine challenge among adults previously immunized with inactivated polio vaccine in Sweden.BMJ global health · 2019Article
Corrections and comments
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Authors and funding
9 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundIn a 2012 Phase II clinical trial, 300 Bangladeshi children aged 24 to 59 months with no prior influenza vaccine exposure were randomized to receive a single intranasally-administered dose of either trivalent, Russian-backbone, live, attenuated influenza vaccine (LAIV) or placebo. Protocol-defined analyses, presented in the companion manuscript, demonstrate decreased viral detection and immunogenicity for A/H1N1pdm09, relative to the A/H3N2 and B strains. This post hoc analysis of the trial data aims to investigate the LAIV strain differences by testing the hypothesis that preexisting humoral and mucosal immunity may influence viral recovery and immune responses after LAIV receipt.
methodsWe used logistic regressions to evaluate the relations between markers of preexisting immunity (ie, hemagglutination inhibition [HAI], microneutralization, and immunoglobulin G and immunoglobulin A (both serum and mucosal antibodies) and LAIV viral recovery in the week post-vaccination. We then tested for potential effect modification by baseline HAI titers (ie, <10 versus ≥10) and week 1 viral recovery on the LAIV-induced serum and mucosal immune responses, measured between days 0 and 21 post-vaccination.
resultsHigher levels of preexisting immunity to influenza A/H3N2 and B were strongly associated with strain-specific prevention of viral shedding upon LAIV receipt. While evidence of LAIV immunogenicity was observed for all 3 strains, the magnitudes of immune responses were most pronounced in children with no evidence of preexisting HAI and in those with detectable virus.
conclusionsThe results provide evidence for a bidirectional association between viral replication and immunity, and underscore the importance of accounting for preexisting immunity when evaluating virologic and immunologic responses to LAIVs. CLINICAL TRIALS REGISTRATION: NCT01625689.
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