Immunity Period After One Dose of Yellow Fever Vaccine in Adults and Children (Paraiba Study)

Phase 4

Active, not recruiting

• Conditions: Yellow Fever Vaccine; Immunity
• Interventions: Biological: yellow fever vaccine

• Registration Number: NCT02555072
• Lead Sponsor: The Immunobiological Technology Institute (Bio-Manguinhos) / Oswaldo Cruz Foundation (Fiocruz)

Brief Summary

The study main objective is to assess the immune status of children and adults who have never vaccinated, they will receive the first dose of 17DD yellow fever vaccine provided by the study and will be monitored for 10 years. Depending on the results of the analyzed of the data, the period of monitoring may be extended.

Detailed Description

This is a Phase IV study cohort, uncontrolled, composed of two segments: children and healthy adults. It will be included 2756 children and 2005 adults, evaluated initially in six different times (before vaccination, 30-45 days, 1 year, 4 years, 7 years and 10 years after vaccination). The Paraiba state was selected for the study because in this region there are no yellow fever virus dissemination and therefore no NIP recommendation for people's routine vaccination. However, the NIP indicate yellow fever vaccination for individuals who are moving to areas with virus circulation. The study will take place in six (6) Basic Health Units of three (3) municipalities (2 units per municipality) in the state of Paraíba. The selected municipalities are: Alhandra, Caaporã and Conde. The study target population consisted of healthy children and adults of both sexes. Children must be between 9 months and 4 years,11months and 29 days; adults between 18 and 50 years. It will be eligible for the study, people who have never received the yellow fever vaccine checked in vaccine design and history and who agree to participate. Not be included participants with any contraindication to vaccination against yellow fever and individuals who previously moved to risk areas for extended periods.

Study Timeline

• Study First Submitted: 2015-04-22
• Study First Submitted QC: 2015-09-17
• Study First Posted: 2015-09-21
• Study Start: 2016-07
• Status Verified: 2023-06
• Last Update Submitted: 2023-06-12
• Last Update Posted: 2023-06-13
• Primary Completion: 2026-06
• Study Completion: 2027-12

Recruitment & Eligibility

• Status: ACTIVE_NOT_RECRUITING
• Sex: All
• Target Recruitment: 4761

Inclusion Criteria

1. Ability to understand and sign the Informed Consent Term
2. Acceptance in participate on the study after reading, understanding and signed the Informed Consent Term
3. Participants of both sexes aged 9-4 years, 11 months and 29 days, after it was provided they have not received or have to receive the MMR or Tetraviral vaccine within 30 days or less.
4. Healthy adults of both sexes aged between 18 and 50 years since they have not received or have to receive the MMR or Tetraviral vaccine within 30 days or less.
5. Residence fixed in the municipality where the Basic Health Unit will held vaccination and collection of biological material samples (blood) for the study at the time of participant enrollment.
6. Availability to follow the proposed activities throughout the study period.
7. Agreement to provide name, address, telephone number and other information for personal contact is possible, if necessary (for example, event of failure to visit scheduled for follow-up).
8. Availability to follow the study protocol.
9. Acceptance for serological testing for HIV.
10. In adult women, it will be conduct pregnancy test (TIG).
11. Being in good health with no significant medical history (such as those described in Exclusion criteria).
12. Physical examination of screening with no significant clinical changes.

Exclusion Criteria

1. Previous vaccination against yellow fever.
2. Presumed or confirmed pregnancy at any stage.
3. Women who are breastfeeding.
4. People in use, or have made use of immunosuppressants medicines.
5. People with personal history of anaphylactic reaction to food, drugs or vaccines.
6. People with personal history of allergy to egg ,erythromycin, kanamycin or gelatin.
7. People with autoimmune diseases.
8. Individuals seropositive for HIV.
9. People with thymic disease history, such as thymoma, myasthenia due to thymectomy and thymoma.
10. People who have received immunoglobulin, blood transfusions or derivatives in the last 60 days.
11. People who have received live virus vaccines or against cholera in the last 30 days, or who plan to receive them within 30 days after vaccination against yellow fever.
12. Individuals who have resided in an endemic area.
13. People with acute febrile disease and a compromised general health.
14. People immunosuppressed by disease (eg, cancer, AIDS, HIV infection with impaired immunity, etc.) or drugs (immunosuppressive drugs, radiotherapy, etc.).

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
naive children and adults for yellow fever vaccine	yellow fever vaccine	both sexes; ages between 9 months and 4 years, 11 months and 29 days old; 18 years to 50 years old

Primary Outcome Measures

Name	Time	Method
Immune response evolution in children and adults for yellow fever vaccine	10 years after vaccination	seropositivity proportion and the yellow fever neutralizing antibodies geometric mean titers.

Secondary Outcome Measures

Name	Time	Method
Immune response evolution in children and adults for yellow fever vaccine that did not respond to the first dose and were revaccinated.	10 years after first vaccination	seropositivity proportion and the yellow fever neutralizing antibodies geometric mean titers.
Association between sociodemographic factors, personal medical history and immune status to yellow fever in children and adults	10 years after vaccination	Number of vaccine doses, age of the participant per years, age at vaccination, gender, personal vaccination record, vaccination history against yellow fever in infants' mothers, history of severe diseases (hospitalization, sequels, disability ), comorbidities and medications used at the time of blood collection.
Interaction between dengue antibodies and the immune response evolution for yellow fever vaccine in children and adults.	1 year after vaccination	Anti-dengue virus IgG antibodies and neutralizing antibodies to yellow fever vaccine.

Trial Locations

Locations (6)

Unidade de Saúde da Família Oiteiro I; 🇧🇷 Alhandra, Paraiba, Brazil

Unidade de Saúde da Família Santo Antônio; 🇧🇷 Caaporã, Paraíba, Brazil

Unidade de Saúde da Família Cupissura I; 🇧🇷 Caaporã, Paraíba, Brazil

Unidade Saúde da Família Mata Redonda 1; 🇧🇷 Alhandra, Paraiba, Brazil

Unidade de Saúde da Família N Sra da Conceição; 🇧🇷 Conde, Paraíba, Brazil

Unidade de Saúde da Família N Sra das Neves; 🇧🇷 Conde, Paraíba, Brazil