VLA1553-403 Pregnancy Surveillance Study
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- The protocol lists: Live-attenuated CHIKV vaccine VLA1553, Vaccine(s) approved for use during pregnancy by the MoH.
- Who it may be relevant to
- Registry conditions: Chikungunya Virus Infection. Basic parameters: from 18 years · Female.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Brazil
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
Unsure about the terms? Read our patient guide →
Official title
Observational Study to Evaluate the Safety of Live-attenuated Chikungunya Virus Vaccine (VLA1553) in Pregnant Women Exposed to the Vaccine in Brazil
Overview
This post-marketing, observational study evaluates pregnancy and infant outcomes up to 12 weeks after delivery among women who received the chikungunya vaccine (VLA1553) during pregnancy or within 30 days before their last menstrual period. A matched comparator cohort of pregnant women vaccinated with routine, pregnancy-recommended vaccines (not exposed to VLA1553) is included. No study procedures beyond routine care are performed.
Detailed description
This is an observational, non-interventional study in pregnant women who were vaccinated with the live-attenuated chikungunya virus vaccine (VLA1553) anytime during their pregnancy or within 30 days preceding their last menstrual period (VLA1553 group). The study protocol includes a comparator group of routinely vaccinated pregnant women not exposed to VLA1553 (control group).
The VLA1553 and control groups will be matched by gestational trimester and maternal age range (women \<35 years of age at the time of enrolment and women \>35 years of age) at exposure time. The study will collect information including vaccine exposure, demographic information, pregnancy data (e.g., date of positive pregnancy test, expected delivery date, previous pregnancy information), and medical history. Furthermore, data on pregnancy and infant outcomes up to 12 weeks post expected delivery date (EDD) will be compiled. The EDD will be calculated by counting 40 weeks from the first day of the LMP. This approach involves collecting data from the participating women onto the database by site staff and, if possible, confirmed and expanded by their PS-HCP as needed. Additionally, with consent, medical records may be accessed by study staff to further verify and supplement the information. This study will not provide or make recommendations on any vaccine use. Participation in the study is voluntary. Participation or lack of participation in this study will not change or influence a participant's standard of care.
Interventions
- Biological Live-attenuated CHIKV vaccine VLA1553
Non-interventional study: VLA1553 is used in the pilot vaccination strategy which will start along with this observational study. - Biological Vaccine(s) approved for use during pregnancy by the MoH
Vaccine(s) approved for use during pregnancy by the MoH
Primary outcome measures
- Frequency (n,%) of individuals with any outcome (pregnancy and infant health), as described in the protocol. [Time frame: Study start through study completion, an average of 12 months]
- Frequency (n,%) of specific outcomes (pregnancy and infant health), as described in the protocol. [Time frame: Study start through study completion, an average of 12 months]
Secondary outcome measures (4)
- Frequency (n,%) of individuals with any outcome (pregnancy and infant health), as described in the protocol in the VLA1553 group and the control group. [Time frame: Study start through study completion, an average of 12 months]
- Frequency (n,%) of specific outcomes (pregnancy and infant health), as described in the protocol in the VLA1553 group and the control group. [Time frame: Study start through study completion, an average of 12 months]
- Relative risk (RR) of any outcome (pregnancy and infant health) between pregnant women vaccinated with VLA1553 and pregnant women vaccinated with other vaccines recommended during pregnancy, as described in the protocol. [Time frame: Study start through study completion, an average of 12 months]
- Frequency (n,%) of individuals with SAEs (women and infants), following vaccination with VLA1553 or a control vaccine. [Time frame: Study start through study completion, an average of 12 months]
Eligibility criteria
Inclusion criteria
VLA1553 vaccinated population:
- Women who have received the single dose of the VLA1553 vaccine during pregnancy or within the 30 days prior to the first day of the last menstrual period.
- Pregnant at the time of enrolment in the study.
- The participant understands and agrees to comply with the study procedures.
Control group:
- Pregnant at the time of enrolment in the study.
- Women who have received vaccine(s) approved for use during pregnancy by the MoH and who meet the matching criteria described in the protocol.
- The participant understands and agrees to comply with the study procedures.
- Women who have not received the VLA1553 vaccine during pregnancy or within the 30 days prior to the first day of the last menstrual period.
Exclusion criteria
- Women who do not provide informed consent.
- Women who are not part of the target population of the pilot vaccination strategy at the time of vaccination.
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: Yes
Study design
- Observational model
- Cohort
Study locations
Brazil · 3 centers
- Universidade Federal de Minas Gerais, CT Terapias Avançadas e Inovadoras — Belo Horizonte
- Centro de Pesquisas Clínicas Universidade Federal Sergipe, Hospital e Maternidade São João — Laranjeiras
- Fundação Faculdade Regional De Medicina De São José Do Rio Preto — São Pedro
Identifiers
NCT: NCT07414524 · VLA1553-403