A Study of Two Doses of WRAIR Dengue Vaccine Administered Six Months Apart to Healthy Adults and Children
A Study of Two Doses of WRAIR Dengue Vaccine Administered Six Months Apart to Healthy Adults and Children
The purpose of this study is to evaluate the safety and effectiveness of two different
 formulations of an investigational dengue vaccine (T-DEN) against a placebo vaccine when two
 doses are given six months apart to adults and children.
In this study, children and adults at multiple sites in Puerto Rico will be randomly
 allocated to receive one of two T-DEN formulations or placebo. Subjects will be stratified by
 age group (a specific number of subjects in each of 4 age groups [12 months to 50 years of
 age] will be enrolled). The study includes 6 scheduled visits and 4 scheduled venipunctures.
 Safety follow-up for dengue may require unscheduled visits and venipunctures.> Multiple DEN
 virus serotypes are endemic in Puerto Rico and all residents are considered to be at risk for
 dengue. The results of this phase II study will provide a basis for identifying the vaccine
 formulations which elicit neutralizing antibodies to all four dengue virus serotypes in a
 high proportion of vaccine recipients. The most immunogenic and well tolerated candidate
 formulation identified in this study will be considered for advancement to phase III
 development.>
Inclusion Criteria:>

 -  Subjects who the investigator believes that they and/or their parents/guardians can
 and will comply with the requirements of the protocol (e.g., completion of the diary
 cards, return for follow-up visits) should be enrolled in the study.>

 -  A healthy male or non-pregnant female between 12 months (mths) and 50 years (yrs) of
 age at the time of the first vaccination;>

 -  Free of obvious health problems as established by medical history and physical
 examination before entering into the study;>

 -  For children: 23mths of age, full compliance with the United States Advisory Committee
 on Immunization Practices (U.S. ACIP) recommended childhood immunization schedule;>

 -  Written informed consent obtained from the subject or a parent/guardian and assent for
 subjects 7-20 yrs of age;>

 -  If the subject is female, she must be of non-childbearing potential, i.e. either
 pre-menarcheal, surgically sterilized or one year post-menopausal; or, if of
 childbearing potential, she must be abstinent or have used adequate contraceptive
 precautions (i.e. intrauterine contraceptive device; condom and spermicide
 combination, oral contraceptives or other equivalent hormonal contraception, e.g.
 progestin implantable, cutaneous hormonal patch or injectable contraceptives) for 30
 days (dys) prior to vaccination, have a negative pregnancy test within 48 hrs prior to
 vaccination and must agree to continue such precautions for 60 dys after completion of
 the vaccination series. Any child who begins menarche during the study period must
 follow the same precautions listed above, from menarche until 60 dys after the second
 vaccine dose.>

 Exclusion Criteria:>

 -  Pregnant or lactating female;>

 -  Female planning to become pregnant or planning to discontinue abstinence or
 contraceptive precautions;>

 -  History of any neurological or behavioral disorder or seizures, with the exception of
 a single febrile seizure in childhood; >

 -  History of allergic disease/reaction likely to be exacerbated by any component of the
 vaccine;>

 -  Acute or chronic, clinically significant pulmonary, cardiovascular, hepatic, renal,
 hematologic or endocrine functional defect, as determined by physical examination or
 laboratory tests;>

 -  Any confirmed or suspected immunosuppressive or immunodeficient condition;>

 -  Acute disease at the time of enrollment (acute disease is defined as the presence of a
 moderate or severe illness with or without fever); note that vaccine can be
 administered to persons with a minor illness such as diarrhea, mild upper respiratory
 infection with or without low-grade febrile illness, i.e., equivalent to an oral
 temperature <37.5°C/<99.5°F.>

 -  Chronic hepatomegaly, right upper quadrant abdominal pain or tenderness;>

 -  Chronic splenomegaly, left upper quadrant abdominal pain or tenderness;>

 -  Use of any investigational or non-registered drug or vaccine other than the study
 vaccine within 30 dys preceding the first dose of study vaccine/placebo or planned use
 during the study period;>

 -  Planned administration of a vaccine not foreseen by the study protocol during the
 period starting from 30 dys before each dose of the study vaccine and ending 30 dys
 after; with the exception of standard infant and children "inactivated" vaccines or
 the inactivated influenza vaccine administered to adults or children; >

 -  A planned move to a location that will prohibit participating in the trial for the 12
 mth duration;>

 -  Chronic administration (defined as more than 14 dys) of immunosuppressants or other
 immune-modifying drugs within 90 dys preceding the first dose or planned
 administration during the study period. For corticosteroids, this will mean
 prednisone, or equivalent, 0.5 mg/kg/day. Inhaled and topical steroids are allowed;>

 -  Administration of immunoglobulins and/or blood products within 90 dys preceding the
 first dose or planned administration during the study period;>

 -  Hypertension;>

 -  Chest pain, palpitations, dizziness, shortness of breath unrelated to asthma,
 arrhythmias or friction rubs;>

 -  Any chronic systemic drug therapy to be continued during the study period (except for
 vitamin/mineral supplements, routine treatment for gastro-esophageal reflux);>

 -  Potential adult volunteers, or parents of potential child volunteers, who do not have
 easy access to a fixed or mobile telephone;>

 -  History of chronic alcohol consumption and/or drug abuse.