Long-Term Study of Hospitalized Dengue & Safety in Thai Children Included in a Tetravalent Dengue Vaccine Efficacy Study

N/ACompletedNCT01983553

Sanofi Pasteur, a Sanofi Company3,203 enrolled

Overview

The purpose of this study was to conduct a passive surveillance of hospitalized dengue cases in participants who participated in study CYD23 (NCT00842530). The Objectives: * To describe the incidence of virologically-confirmed hospitalized dengue cases. * To characterize hospitalized dengue cases. * To evaluate the occurrence of related and fatal serious adverse events (SAEs).

This study was a passive surveillance of hospitalized dengue cases in participants who participated in study CYD23 (NCT00842530) where participants were initially randomized to receive 3 injections of either CYD dengue vaccine or control at 6 month intervals. Any SAE related to a study procedure or related to a previous injection from study CYD23, or any fatal SAEs (even if unrelated) were reported to the Sponsor. An Independent Data Monitoring Committee (IDMC) was also involved in the regular review of virologically-confirmed hospitalized dengue cases. Any fatal outcome or related SAE were be promptly reviewed by the IDMC. No study vaccinations were administered.

Study Type

OBSERVATIONAL

Enrollment

3,203

Conditions

Dengue Dengue Fever Dengue Hemorrhagic Fever

Eligibility

Sex: ALLMin age: 7 YearsMax age: 16 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Ongoing participation in study CYD23 at the time of enrolment. * Assent form was signed and dated by the participant (for participants \>= 7 years old), and informed consent form was signed and dated by the parent(s) or another legally accepted representative and by 2 independent witnesses. * Participant and parent/legally accepted representative were able to attend all scheduled visits to comply with all study procedures. Exclusion Criteria: * Planned participation in another dengue clinical trial during the present study * Deprived of freedom by an administrative or court order, or in an emergency setting, or hospitalized involuntarily.

Locations (1)

Unnamed facility

Ratchaburi, Muang District, Thailand

Outcomes

Primary Outcomes

Event Rate Per 100 Participant-years for Hospitalized Virologically-Confirmed Dengue (VCD) Cases Due to Any and Each Serotype Following Vaccination With Either CYD Dengue Vaccine or Placebo in the Previous Study (CYD23)

Time frame: Year 1 to Year 4 post- 3rd vaccination at Month 12 in CYD23

Number of Hospitalized VCD Cases Due to Any and Each Serotype (1, 2, 3 and 4) Following Vaccination With Either CYD Dengue Vaccine or a Placebo in a Previous Study (CYD23)

Cases were defined as the number of participants with at least one hospitalized VCD episode.

Time frame: Year 1 to Year 4 post- 3rd vaccination at Month 12 in CYD23

Number of Episodes of Hospitalized VCD Due to Any and Each Serotype (1, 2, 3 and 4) Following Vaccination With Either CYD Dengue Vaccine or a Placebo in a Previous Study (CYD23)

Episodes were defined as the number of hospitalized VCD episodes.

Time frame: Year 1 to Year 4 post- 3rd vaccination at Month 12 in CYD23

Event Rate Per 100 Participant-years for Hospitalized VCD Cases Due to Any and Each Serotype Collected By Age Group (Aged: 4-5; 6-11 Years) Following Vaccination With Either CYD Dengue Vaccine or Placebo in a Previous Study (CYD23)

Time frame: Year 1 to Year 4 post- 3rd vaccination at Month 12 in CYD23

Number of Hospitalized VCD Cases Due to Any and Each Serotype (1, 2, 3 and 4) Collected By Age Group (Aged: 4-5; 6-11 Years) Following Vaccination With Either CYD Dengue Vaccine or Placebo in a Previous Study (CYD23)

Data from ClinicalTrials.gov

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Event Rate Per 100 Participant-years for Hospitalized VCD Cases Due to Any and Each Serotype and Meeting World Health Organization (WHO) 1997 Criteria Collected Following Either CYD Dengue Vaccine or Placebo in a Previous Study (CYD23)

Event rate per 100 participant-years for hospitalized VCD cases, due to any and each serotype (1, 2, 3 and 4) following vaccination with either CYD Dengue vaccine or Placebo in the previous study (CYD23) were reported. Endpoint values \<0.1 were rounded to 0.1. The WHO criteria were fever, any haemorrhagic manifestations, thrombocytopenia, plasma leakage or pleural effusion and/or ascites and/or hypoalbuminemia. Dengue haemorrhagic fever was graded as Grade I: Fever accompanied by non-specific constitutional symptoms; the only hemorrhagic manifestation is a positive tourniquet test. Grade II: Spontaneous bleeding in addition to the manifestations of Grade I participants, usually in the form of skin and/or other hemorrhages. Grade III: Circulatory failure manifested by rapid and weak pulse, narrowing of pulse pressure (20 mmHg or less) or hypotension, with the presence of cold clammy skin and restlessness. Grade IV: Profound shock with undetectable blood pressure and pulse.

Time frame: Year 1 to Year 4 post- 3rd vaccination at Month 12 in CYD23

Number of Hospitalized VCD Cases Due to Any and Each Serotype (1, 2, 3 and 4) and Meeting WHO 1997 Criteria Following Vaccination With CYD Dengue Vaccine or Placebo in a Previous Study (CYD23)

Cases were defined as the number of participants with at least one hospitalized VCD episode meeting WHO criteria. The WHO criteria was fever, any haemorrhagic manifestations, thrombocytopenia, plasma leakage or pleural effusion and/or ascites and/or hypoalbuminemia. Dengue hemorrhagic fever was graded as - Grade I: Fever accompanied by non-specific constitutional symptoms; the only hemorrhagic manifestation was a positive tourniquet test. Grade II: Spontaneous bleeding in addition to the manifestations of Grade I participants, usually in the form of skin and/or other hemorrhages. Grade III: Circulatory failure manifested by rapid and weak pulse, narrowing of pulse pressure (20 mmHg or less) or hypotension, with the presence of cold clammy skin and restlessness. Grade IV: Profound shock with undetectable blood pressure and pulse.

Time frame: Year 1 to Year 4 post- 3rd vaccination at Month 12 in CYD23

Number of Episodes of Hospitalized VCD Cases Due to Any and Each Serotype (1, 2, 3 and 4) and Meeting WHO 1997 Criteria Following Vaccination With CYD Dengue Vaccine or Placebo in a Previous Study (CYD23)

Episodes were defined as the number of hospitalized virologically confirmed dengue episodes meeting WHO criteria. The WHO criteria was fever, any haemorrhagic manifestations, thrombocytopenia, plasma leakage or pleural effusion and/or ascites and/or hypoalbuminemia. Dengue haemorrhagic fever was graded as Grade I: Fever accompanied by non-specific constitutional symptoms; the only hemorrhagic manifestation is a positive tourniquet test. Grade II: Spontaneous bleeding in addition to the manifestations of Grade I participants, usually in the form of skin and/or other hemorrhages. Grade III: Circulatory failure manifested by rapid and weak pulse, narrowing of pulse pressure (20 mmHg or less) or hypotension, with the presence of cold clammy skin and restlessness. Grade IV: Profound shock with undetectable blood pressure and pulse.

Time frame: Year 1 to Year 4 post- 3rd vaccination at Month 12 in CYD23