A study in healthy adults having received a single vaccine administration to support the development of immunological assays

Subjects who the investigator believes that they can and will comply with the requirements of the protocol (e.g. return for follow-up visits).

• A male or female between, and including, 18 and 50 years of age at study start.
• A subject having received a Yellow Fever (YF) vaccine on the day of study entry.
• Written informed consent obtained from the subject.
• Healthy subjects as established by medical history and clinical examination performed on the day of YF vaccination.
• Female subjects of non-childbearing potential may be enrolled in the study.
• Female subjects of childbearing potential may be enrolled in the study, if the subject:

Use of any investigational or non-registered product (drug or vaccine) within 30 days preceding study start, or planned use during the study period.

• Concurrently participating in another clinical study, within 3 months preceding study start and at any time during the study period, in which the subject has been or will be exposed to an investigational or a non-investigational product (pharmaceutical product or device).
• Clinically significant anaemia or any known condition as per medical history that would preclude the drawing of blood as described in the protocol.
• Known previous infection with YF virus.
• Previous vaccination against YF more than approximately 5 hours before the blood sampling at Visit 1.
• Administration of immunoglobulins and/or any blood products within the 3 months preceding the study start or planned administration during the study period.
• Chronic administration (defined as more than 14 days in total) of immunosuppressants or other immune-modifying drugs (including chloroquine) within six months prior to the study start. For corticosteroids, this will mean prednisone ≥ 10mg/day, or equivalent. Inhaled and topical steroids are allowed.
• Receipt of live attenuated vaccines other than the YF vaccine during the period beginning 30 days preceding the blood sampling at Visit 1 or planned use during the study up to the blood sampling at Visit 2.
• Receipt of inactivated influenza vaccines (seasonal or pandemic) during the period beginning 21 days preceding the blood sampling at Visit 1 or planned use during the study up to the blood sampling at Visit 2.
• History of malignancy (unless there has been surgical excision followed by a sufficient observation period, of at least 5 years, to give a reasonable assurance of sustained cure and which, in the estimate of the investigator, is not likely to recur during the study period).
• Any confirmed or suspected immunosuppressive or immunodeficient condition (including HIV, hepatitis B and hepatitis C), based on medical history and physical examination (no laboratory testing required).
• Family history of congenital or hereditary immunodeficiency.
• Major congenital defects or serious chronic illness.
• Acute or chronic, clinically significant pulmonary, cardiovascular, hepatic or renal functional abnormality, as determined by physical examination and medical history.
• Acute disease and/or fever at the time of enrolment.
• Known pregnant or lactating female, as per medical records.
• Female planning to become pregnant or planning to discontinue contraceptive precautions.
• History of chronic alcohol consumption and/or drug abuse.
• Any condition that may preclude the compliance to the study protocol.