Dengue viruses can cause dengue fever and other serious health conditions, primarily affecting people living in tropical regions of the world. This study will evaluate the safety and immune responses of five formulations of a tetravalent dengue virus vaccine in healthy adults.
Dengue viruses cause dengue fever and the more severe condition, dengue hemorrhagic fever/shock syndrome. Dengue viruses are common in most tropical and subtropical regions of the world and infection with dengue viruses is the leading cause of hospitalization and death in children in many tropical Asian countries. For these reasons, the World Health Organization (WHO) has made the development of a dengue virus vaccine a top priority. This study will evaluate the safety and immunogenicity of five versions of a live, attenuated, tetravalent dengue virus vaccine called TetraVax-DV. This study will enroll healthy adults 18-50 years old. Participants will be randomly assigned to receive one of the five versions of TetraVax-DV or placebo. At the vaccination study visit, participants will undergo a medical history review, physical examination, blood and urine collection, and vital sign measurements. Participants will then receive one injection of their assigned vaccine or placebo in the upper arm. After receiving the vaccine, participants will remain in the clinic for 30 minutes for observation. At home, participants will monitor and record their temperature three times a day for 16 days. Additional study visits will occur at Days 2, 4, 6, 8, 10, 12, 14, 16, 21, 28, 42, and 180 for physical exams, assessment of symptoms, and blood and urine collection. Some participants will attend an additional study visit at Day 60. Participants who received one of the five versions of the vaccine will be asked to take part in an optional substudy that will evaluate the safety and immunogenicity of a second vaccination 6 months after the first vaccination. In the substudy, participants will be randomly assigned to receive either the same vaccine they received in the first part of the study or a placebo vaccine. For 6 months following the second vaccination, participants will attend study visits and take part in the same study procedures that occurred in the first part of the study.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
TRIPLE
Enrollment
141
One subcutaneous injection of a recombinant live attenuated TetraVax-DV vaccine, admixture 1 (10\^3 PFU of rDEN1Δ30, 10\^3 PFU of rDEN2/4Δ30\[ME\], 10\^3 PFU of rDEN3-3´D4Δ30, 10\^3 PFU of rDEN4Δ30)
One subcutaneous injection of a recombinant live attenuated TetraVax-DV vaccine, admixture 2 (10\^3 PFU of rDEN1Δ30, 10\^3 PFU of rDEN2/4Δ30\[ME\], 10\^3 PFU of rDEN3-3´D4Δ30, 10\^3 PFU of rDEN4Δ30-200,201)
One subcutaneous injection of a recombinant live attenuated TetraVax-DV vaccine, admixture 3 (10\^3 PFU of rDEN1Δ30, 10\^3 PFU of rDEN2/4Δ30\[ME\], 10\^3 PFU of rDEN3Δ30/31-7164, 10\^3 PFU of rDEN4Δ30)
Center for Immunization Research, Johns Hopkins School of Public Health
Washington D.C., District of Columbia, United States
Center for Immunization Research, Johns Hopkins School of Public Health
Baltimore, Maryland, United States
Fletcher Allen Health Care (FAHC), General Clinical Research Center (GCRC)
Burlington, Vermont, United States
University of Vermont Vaccine Testing Center
Burlington, Vermont, United States
Safety of five TetraVax-DV admixtures, as assessed by the frequency of vaccine-related adverse events (AEs), graded by severity
Time frame: Measured out to Day 28
Determination of the serum plaque reduction neutralization titer 60% (PRNT_60) to DEN1, DEN2, DEN3, and DEN4 viruses
Time frame: Measured at Days 0, 28, 42, and 180
Monovalent, bivalent, trivalent, and tetravalent seropositivity and seroconversion rates
Time frame: Measured at 4 and 6 weeks after vaccination
Seropositivity and seroconversion rates to greater than 60% in in the TetraVax-DV admixture 5 vaccine arm
Time frame: Measured by Day 42
Frequency, quantity, and duration of viremia following vaccination
Time frame: Measured out to Day 21
Number of vaccinees infected with DEN1, DEN2, DEN3, and DEN4
Time frame: Measured by Day 42
Duration of the neutralizing antibody response
Time frame: Measured at Day 180
Safety and immunogenicity of a second dose of vaccine given 6 months after the first dose (optional substudy)
Time frame: Measured at Day 222 (42 days after second dose)
Seroconversion as assessed by a greater than or equal to 4-fold rise in DEN1, DEN2, DEN3, or DEN4 neutralizing antibody titers compared with the pre-vaccination antibody titer
Time frame: Measured by Day 42
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One subcutaneous injection of a recombinant live attenuated TetraVax-DV vaccine, admixture 4 (10\^3 PFU of rDEN1Δ30, 10\^3 PFU of rDEN2/4Δ30\[ME\], 10\^3 PFU of rDEN3Δ30/31-7164, 10\^3 PFU of rDEN4Δ30-200,201)
One subcutaneous injection of a placebo containing vaccine diluent but no actual vaccine
One subcutaneous injection of a recombinant live attenuated TetraVax-DV vaccine, admixture 5 (10\^3 PFU of rDEN1Δ30, 10\^4 PFU of rDEN2/4Δ30(ME), 10\^3 PFU of rDEN3Δ30/31-7164, and 10\^3 PFU of rDEN4Δ30)
Seropositivity as assessed by PRNT_60 to DEN1, DEN2, DEN3, DEN4 greater than or equal to 1:10 compared with the pre-vaccination titer
Time frame: Measured by Day 42