Safety and Immunogenicity of the Butantan Quadrivalent Influenza Vaccine

Inclusion Criteria:

1. Male or female, age 3 years or older at the time of enrollment.
2. Provide written informed consent
3. Agrees to complete all study visits, procedures and contacts
4. Women and adolescents of childbearing age: Negative pregnancy test with understanding (through informed consent process).

Exclusion Criteria:

1. Chronic medical conditions such as psychiatric conditions, diabetes, hypertension or any other conditions that might place the subjects at high risk of adverse events. Study clinicians will use clinical judgment on a case-by-case basis to assess safety risks under this criterion.
2. Clinically significant abnormalities on physical examination.
3. Use of immunosuppressive medications such as systemic corticosteroids or chemotherapeutics, or immunosuppressive illness.
4. Women who are pregnant or planning to become pregnant during the study period plus 3 months beyond the last vaccine dose and currently nursing women.
5. Participation in research involving another investigational product within 30 days before planned date of first vaccination or anytime through the last study safety visit.
6. Clinically significant abnormalities on basic laboratory screening tests.
7. Acute febrile illness (axillar temperature ≥ 37.8°C)
8. Hypersensitivity to egg or chicken proteins or any of the vaccine constituents
9. Thrombocytopenia or a bleeding disorder contraindicating intramuscular vaccination
10. Unstable chronic illness (defined as illness requiring hospitalization or a clinically significant change in medication in the previous 12 weeks).
11. Alcohol abuse of alcohol or drug addiction
12. Any vaccination within the previous 4 weeks
13. Seasonal influenza vaccination in the current year