Study to Investigate the Safety and Immunogenicity of a Tetravalent Chimeric Dengue Vaccine in Healthy Volunteers Between the Ages of 1.5 - 45 Years

Solicited local injection site reactions were collected by subject diary and graded based on the Common Terminology Criteria for Adverse Events (CTCAE), Version 4.03 for pain [Grade 0 (no pain), 1 (mild), 2 (moderate) and 3 (severe)] and itching (pruritus) [Grade 0 (no itching), 1 (mild), 2 (moderate) and 3 (Severe]. Severity grade for redness (erythema) and swelling (edema/induration) were derived from recorded length of the longest diameter measurement using the FDA Guidance for Industry: Toxicity Grading Scale of Healthy Adult and Adolescent Volunteers Enrolled in Preventive Vaccine Clinical Trial were Grade 0 (<2.5 cm), 1 (mild: 2.5-5 cm), 2 (moderate: 5.1-10 cm) and 3 (severe: >10 cm) and Grade 4 (Potentially Life-threatening: necrosis or exfoliative dermatitis).

Solicited local injection site reactions were collected by subject diary and graded based on the Common Terminology Criteria for Adverse Events (CTCAE), Version 4.03 for pain [Grade 0 (no pain), 1 (mild), 2 (moderate) and 3 (severe)] and itching (pruritus) [Grade 0 (no itching), 1 (mild), 2 (moderate) and 3 (Severe]. Severity grade for redness (erythema) and swelling (edema/induration) were derived from recorded length of the longest diameter measurement using the FDA Guidance for Industry: Toxicity Grading Scale of Healthy Adult and Adolescent Volunteers Enrolled in Preventive Vaccine Clinical Trial were Grade 0 (<2.5 cm), 1 (mild: 2.5-5 cm), 2 (moderate: 5.1-10 cm) and 3 (severe: >10 cm) and Grade 4 (Potentially Life-threatening: necrosis or exfoliative dermatitis).

Solicited systemic AEs (headache, muscle pain [myalgia], joint pain [arthralgia], eye pain, sensitivity to light [photophobia], tiredness [fatigue], body rash, nausea, were recorded in the participant's-diary along with vomiting [number of times]), and body temperature). Diary-recorded severity grades were based on the Common Terminology Criteria for Adverse Events (CTCAE). Severity grades were: Mild (Grade 1): transient symptoms, discomfort noticed but was easily tolerated by the participant with no interference to normal daily activities. Moderate (Grade 2): marked symptoms, moderate interference with participant's daily activities. Severe (Grade 3): Considerable interference with participant's daily activities. The CTCAE severity grades for fever and vomiting were derived from the diary-recorded measurements of temperature level and number of episodes, respectively.

An AE is defined as any untoward medical occurrence in a clinical investigation participant administered a drug; it does not necessarily have to have a causal relationship with this treatment. Solicited local injection site reactions included pain, itching, erythema, edema and solicited systemic AEs include myalgia, arthralgia, eye pain, photophobia, fatigue, body rash, nausea, vomiting, and fever.

An Adverse Event (AE) is defined as any untoward medical occurrence in a clinical investigation participant administered a drug; it does not necessarily have to have a causal relationship with this treatment. The severity of all unsolicited AEs was evaluated by the Investigator (using the Common Terminology Criteria for Adverse Events [CTCAE] v4.03) as follows. Mild (Grade 1): Transient symptoms, discomfort noticed but was easily tolerated by the participant with no interference to normal daily activities. Moderate (Grade 2): Marked symptoms, moderate interference with participant's daily activities. Severe (Grade 3): Considerable interference with participant's daily activities.

Seropositivity rate, defined as the percentage of participants seropositive, was derived from titers of dengue-neutralizing antibodies. Participants were classified by titer after Day 0 as seropositive or seronegative. Seropositive was defined as a MNT50 titre value of ≥10 for any serotype and seronegative was defined as titre value of less than (<) 10 for all 4 serotypes. Seropositivity was assessed for the four dengue serotypes: TDV-1, TDV-2, TDV-3, TDV-4.

Vaccine viremia was assessed for each of the four vaccine strain serotypes: TDV-1, TDV-2, TDV-3 and TDV-4 for Part-1. Vaccine viral ribonucleic acid (RNA) was detected by a quantitative reverse transcription-polymerase chain reaction (qRT-PCR) assay.

Seropositivity rate, defined as the percentage of participants seropositive, was derived from titers of dengue-neutralizing antibodies. Participants were classified by titer after Day 0 as seropositive or seronegative. Seropositive was defined as a MNT50 titre value of ≥10 and seronegative was defined as titre value of less than (<) 10. Seropositivity was assessed for the four dengue serotypes: TDV-1, TDV-2, TDV-3, TDV-4.

Seroconversion rate was defined as the percentage of participants with microneutralization test 50% (MNT50) titer ≥10 or, if the titer on Day 0 was ≥10, a 4-fold rise in antibody titer.

GMTs were assessed for the four dengue serotypes: TDV-1, TDV-2, TDV-3, and TDV-4.

Dengue fever was assessed in participants who had 3 consecutive days of fever >38°C and tested positive for dengue virus by polymerase chain reaction (PCR) analysis.