ClinicalTrials.gg
RecruitingNCT04486638DNG00044Updated Jan 21, 2026

Dengvaxia US Pregnancy Registry

An observational study in Dengue Virus Infection, sponsored by Sanofi Pasteur, a Sanofi Company. Recruiting at 1 site in Puerto Rico. Per ClinicalTrials.gov, last updated 2026-01-21.

Sponsored by Sanofi Pasteur, a Sanofi Company (part of Sanofi) · Observational

From the registry’s dates

  • Started Jan 2023; still recruiting 3 years 10 months later.
Study type
Observational
Model
Cohort
Time perspective
Prospective
Enrollment
500
Sex
All
01

Study summary

The primary objective of this study is to assess maternal, obstetrical, pregnancy, and neonatal and infant outcomes among women and their offspring(s) vaccinated with Dengvaxia during their pregnancy

Read the detailed description

Exposed pregnant women will be followed up to the end of their pregnancy, and the offspring(s) will be followed up to 1 year of age.

02

Conditions studied

  • Dengue Virus Infection

Browse trials for

03

In context

Dengue

283 studies on the registry are indexed under Dengue; 44 are open to participants now.

This study's planned enrollment of 500 is below the median of 595 across 80 observational studies indexed under Dengue.

Browse Dengue studies →

Lead sponsor

Sanofi Pasteur, a Sanofi Company is the lead sponsor of 374 studies on the registry; 4 are open to participants now.

Of its 94 completed or terminated interventional studies of FDA-regulated products, 73 (78%) have results posted.

First submitted after Sanofi Pasteur became part of Sanofi.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
Child (0–17), Adult (18–64), Older adult (65+)
Sexes eligible
All
Accepts healthy volunteers
Yes
Sampling method
Non-probability sample

Study population

Pregnant women of any age and their offspring(s) residing in the US and its Territories whose Dengvaxia pregnancy exposure is reported to the pregnancy registry

Eligibility criteria

The eligible population will include pregnant women of any age and their offspring(s) residing in the US and its Territories whose Dengvaxia pregnancy exposure is reported to the pregnancy registry.

Reports of Dengvaxia pregnancy exposure must contain the following information to be included in the registry:

  • Sufficient evidence to confirm the case qualifies as "exposed during pregnancy";
  • Vaccine name (brand or generic) is provided (i.e., including manufacturer unknown exposures).

The above information is not intended to contain all considerations relevant to a patient's potential participation in a clinical trial.

05

Study design

Observational model
Cohort
Time perspective
Prospective
Enrollment
500 participants (estimated)
Target follow-up
22 Months
Patient registry
Yes

Groups and cohorts

  • Pregnant women and their offspring(s)

    Women and their offspring(s) exposed to Dengvaxia during pregnancy

    Biological: Dengue Tetravalent Vaccine, Live

Interventions

  • BiologicalDengue Tetravalent Vaccine, Live

    Pharmaceutical form: Powder and solvent for suspension for injection Route of administration: Subcutaneous

06

What researchers measure

Primary outcomes

  1. Percentage of pregnant women with maternal adverse events

    Maternal adverse events are reported as serious or non-serious

    Time frame: From vaccination until end of follow-up (maximum 22 months after cohort entry)

  2. Pecentage of women with obstetrical adverse events

    Obstetrical adverse events are collected during pregnancy, labour, delivery and puerperium, and are reported as serious or non-serious

    Time frame: From vaccination until 1 month post-delivery

  3. Percentage of participants with adverse pregnancy outcome

    Adverse pregnancy outcomes include ectopic pregnancy, elective/induced abortion with no fetal defect(s) or fetus status unknown, elective/induced abortion with fetal defect(s), spontaneous abortion/miscarriage (\<20 weeks), stillbirth/fetal death at 20-27 weeks, fetal death at ≥28 weeks, and fetal death due to maternal death

    Time frame: On day of birth

  4. Percentage of offsprings with neonatal adverse events

    Neonatal events are reported as serious or non-serious

    Time frame: From day of birth to 28 days post-birth

  5. Percentage of offsprings with infant adverse events

    Infant events are reported as serious or non-serious

    Time frame: From 29 days to 365 days post-birth

07

Study locations

1 of 1 sites recruiting
  • Investigational Site
    San Juan, Puerto Rico
    Recruiting
08

References and documents

Individual participant data

Plan to share: Yes — Qualified researchers may request access to patient level data and related study documents including the clinical study report, study protocol with any amendments, blank case report form, statistical analysis plan, and dataset specifications. Patient level data will be anonymized and study documents will be redacted to protect the privacy of trial participants. Further details on Sanofi's data sharing criteria, eligible studies, and process for requesting access can be found at: https://vivli.org

No publications or documents are linked to this record.

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Jan 21, 2026, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT04486638
Responsible party
Sponsor
First posted
Jul 24, 2020
Start date
Jan 1, 2023
Primary completion
Jun 30, 2029 (estimated)
Completion
Jun 30, 2029 (estimated)
Last update
Jan 21, 2026

Study contacts

Dengvaxia US Pregnancy Registry HelpLine
Contact
1-800-822-2463
Trial Transparency email recommended (Toll free number for US & Canada)
Contact
contact-us@sanofi.com
800-633-1610 ext. option 6
Clinical Sciences & Operations
study director · Sanofi

Oversight

Data monitoring committee
No
FDA-regulated drug
No
View the source record on ClinicalTrials.gov ↗

Interested in this study?

Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.

No contact was published for this record. The registry link below has the sponsor’s details.

Follow this study

Get an email when the registry record changes — status, dates, results — or when someone posts here.

Sign in to follow

Discussion

Questions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.

Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.

Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.

Start the discussion