Clinical Trial

Observational Study to Assess the Effectiveness of VLA1553 Vaccine in Preventing Chikungunya During a Pilot Vaccination Strategy in Brazil

Enrolling by Invitation
View on ClinicalTrials.gov →
Summary
This is an observational, non-interventional, test-negative case-control (TNCC) study to estimate the vaccine effectiveness of VLA1553 against Chikungunya virus in a real-world setting.
Protocol Amendment History 2 amendments
This ClinicalTrials.gov record has been amended 2 times since 2026-01-07; most recent amendment 2026-07-16.
Status change: Not Yet Recruiting → Enrolling by Invitation 2026-02-09
Trial Details
NCT Number NCT07347002
Lead Sponsor Valneva Austria GmbH
Collaborators: Butantan Foundation, Coalition for Epidemic Preparedness Innovations
Conditions Chikungunya Virus Infection
Enrollment 1,200 participants
Start Date 2026-02-02
Primary Completion 2027-12-31 (estimated)
Study Completion 2027-12-31 (estimated)
Updated on ClinicalTrials.gov 2026-07-17