One shot or two? study tests best way to give tdap and RSV vaccines in pregnancy

NCT ID NCT07097012

Recruiting now Prevention Sponsor: Canadian Immunization Research Network Source: ClinicalTrials.gov ↗

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study is looking at whether it's safe and effective to give the Tdap vaccine (for whooping cough) and the RSV vaccine at the same doctor's visit during pregnancy, or if they should be given separately. The researchers will recruit 60 healthy pregnant individuals and randomly assign them to receive both vaccines together or at different visits. The main goal is to see if a larger trial is possible, but they will also track side effects and immune responses in mothers and babies.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

Active substance: Tdap vaccine (tetanus, diphtheria, acellular pertussis) and RSV vaccine (respiratory syncytial virus)
What this could lead to: If successful, this could show that giving both vaccines at the same visit is safe and effective, simplifying prenatal care and protecting both mother and baby from whooping cough and RSV.
What could go wrong: This is a small pilot study with only 60 participants, focused on feasibility, not on proving the vaccines work. Results may not apply to all pregnant individuals, and the study may not detect rare side effects.

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Conditions

The condition(s) this trial relates to.

diphtheria pertussis prevention target respiratory syncytial virus infectious disease prevention target

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

HEALTHY PREGNANCY RSV TDAP - TETANUS, DIPHTHERIA AND ACELLULAR PERTUSSIS VACCINATION

Contacts and locations

Locations

Canadian Center for Vaccinology
RECRUITING

Halifax, Nova Scotia, Canada
Centre hospitalier universitaire Ste-Justine
RECRUITING

Montreal, Quebec, Canada
The Ottawa Hospital Research Institute
RECRUITING

Ottawa, Ontario, Canada
Vaccine Evaluation Center
ACTIVE_NOT_RECRUITING

Vancouver, British Columbia, Canada

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