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OpenTrials
Completed

NCT Number: NCT06998004

A Trial to Evaluate the Safety and Immunogenicity of an Investigational Vaccine for the Prevention of Yellow Fever, and of an Investigational Vaccine for the Prevention of Rabies, in Healthy Adults

The purpose of this first time in humans trial is to evaluate the safety, reactogenicity and immunogenicity of AVX70120 and of AVX70481 in healthy participants.

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Key information

Age range

18 year–40 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 1

Primary location

Centre for the Evaluation of Vaccination (CEV), Antwerp, Belgium

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Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Male or female between, and including, 18 and 40 years of age on the day of the Screening Visit
  • Healthy individual, as established by the Investigator
  • Able to read and understand the informed consent form, and written informed consent obtained from the participant
  • Participants who, in the opinion of the Investigator, can and will comply with the requirements of the protocol

Exclusion criteria

  • Body Mass Index <18.0 or >32.0 kg/m2
  • Use of any investigational or non-registered product other than the study intervention within 1 month preceding study vaccination, or planned use during the study period
  • Concurrently participating in another clinical study, at any time during the study period, in which the participant has been or will be exposed to an investigational or non-registered product
  • Administration / planned administration of any vaccine not foreseen by the study protocol within 1 month preceding study vaccination and up to Day 31
  • Chronic administration of immunosuppressants or other immune-modifying drugs within 6 months preceding study vaccination, or planned chronic administration at any time during the study period
  • Planned administration of long-acting immune-modifying drugs at any time during the study period
  • Administration of immunoglobulins and / or any blood or blood-derived products within 3 months preceding study vaccination, or planned administration during the study period
  • Any confirmed or suspected immunosuppressive or immunodeficient condition, based on medical history, family history or physical examination
  • History of or current autoimmune disease
  • Personal or family history of thymic pathology
  • History of any neurological disorders or seizures
  • History of any reaction or hypersensitivity likely to be exacerbated by any component of the investigational vaccines
  • Malignancies or lymphoproliferative disorders within previous 5 years
  • Moderate or severe acute disease in the opinion of the Investigator, and / or fever at the time of study intervention
  • Alcohol, prescription drug, or substance (ab)use that, in the opinion of the Investigator, might interfere with the study conduct or completion
  • Pregnant or lactating woman
  • Woman of childbearing potential who is not utilising a highly effective birth control method for at least 1 month preceding study vaccination, or planning to discontinue highly effective birth control methods during the study period.
  • Participants employed by the Sponsor, by the vendors working on behalf of the Sponsor, by the Investigator or the study site, or close relatives of research staff working on this study
  • Medical condition or use of medication(s) that can increase the risk of bleeding or haematoma
  • Any other condition or finding that the Investigator judges may interfere with study procedures or study results

Note: other protocol-defined inclusion / exclusion criteria may apply.

Treatment and study plan

AVX70120 low dose level

Biological

Low dose level of AVX70120, AstriVax' investigational vaccine for the prevention of yellow fever

AVX70120 middle dose level

Biological

Middle dose level of AVX70120, AstriVax' investigational vaccine for the prevention of yellow fever

AVX70120 high dose level

Biological

High dose level of AVX70120, AstriVax' investigational vaccine for the prevention of yellow fever

AVX70481 low dose level

Biological

Low dose level of AVX70481, AstriVax' investigational vaccine for the prevention of rabies

AVX70481 middle dose level

Biological

Middle dose level of AVX70481, AstriVax' investigational vaccine for the prevention of rabies

AVX70481 high dose level

Biological

High dose level of AVX70481, AstriVax' investigational vaccine for the prevention of rabies

Placebo

Other

Placebo

Primary outcomes

  1. Occurrence of solicited adverse events

    Time frame: During a 14-day follow-up period after vaccination

  2. Occurrence of unsolicited adverse events

    Time frame: From Day 1 up to 1 month after vaccination

  3. Occurrence of hematological and biochemical laboratory abnormalities

    Time frame: From Day 1 up to 6 months after vaccination

  4. Occurrence of adverse events of special interest

    Time frame: From Day 1 up to 1 year after vaccination

  5. Occurrence of serious adverse events

    Time frame: From Day 1 up to 1 year after vaccination

Secondary outcomes

  1. Humoral immune response following administration of the investigational vaccines

    Time frame: From Day 1 up to 1 year after vaccination

Sponsors and collaborators

Lead sponsor

AstriVax Therapeutics

Industry

Registry information

Official study title

A Phase I, Randomized, Double-blind, Multi-centre, Placebo-controlled, Dose-escalation Study to Evaluate the Safety, Reactogenicity and Immunogenicity of AstriVax' Investigational Vaccine for the Prevention of Yellow Fever (AVX70120), and of AstriVax' Investigational Vaccine for the Prevention of Rabies (AVX70481), in Healthy Adults Aged 18 to 40 Years

Acronym: SAFYR

Important dates

Study start
2024
Primary completion
2026
Study completion
2026
First posted
May 31, 2025
Registry last updated
Apr 22, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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