Evaluation of the Safety and Efficacy of a Single Dose of a Dengue Vaccine (TV005) in Healthy Adults

There are four types of dengue viruses (DENV-1, DENV-2, DENV-3, and DENV-4), each of which
can cause mild to life-threatening illness. This study will evaluate the protective efficacy
of TV005 (a dengue virus vaccine) administered at Day 0 against viremia and rash induced by
rDEN2∆30-7169 (a live attenuated candidate DENV-2 vaccine) administered at Day 180. The
safety and immunogenicity of the TV005 and rDEN2∆30-7169 vaccines will also be evaluated.

This study will enroll healthy adults with no history of previous infection with a dengue
virus or a flavivirus. Participants will be randomly assigned to receive a single injection
of TV005 or placebo at study entry (Day 0). All participants will receive a single injection
of rDEN2∆30-7169 on Day 180. For at least 30 minutes after each vaccination, participants
will remain in the study clinic to be monitored for any adverse effects of the vaccines.
Participants will record their temperature three times a day for 16 days after the first and
second vaccinations.

In addition to study visits at Day 0 and 180, participants will attend study visits at Day
4, 6, 8, 10, 12, 14, 16, 21, 28, 56, 90, 150, 184, 186, 188, 190, 192, 194, 196, 201, 208,
236, 270, and 360. At select study visits, participants will undergo a physical examination,
medical history review, blood collection, and a pregnancy test for female participants.

Inclusion Criteria:

- Adult male or female between 18 and 50 years of age, inclusive

- Good general health as determined by physical examination, laboratory screening, and
review of medical history

- Available for the duration of the study, approximately 26 weeks post-second
inoculation

- Willingness to participate in the study as evidenced by signing the informed consent
document

- Females Only: Female participants of childbearing potential willing to use effective
contraception. Reliable methods of contraception include: hormonal birth control,
condoms with spermicide, diaphragm with spermicide, surgical sterilization,
intrauterine device, and abstinence (6 months or longer since last sexual encounter).
All female participants will be considered having childbearing potential except for
those with hysterectomy, tubal ligation, tubal coil (at least 3 months prior to
vaccination), or post-menopausal status documented as at least 1 year since last
menstrual period.

Exclusion Criteria:

- Females Only: Currently pregnant, as determined by positive beta-human
choriogonadotropin (HCG) test, breastfeeding

- Evidence of clinically significant neurologic, cardiac, pulmonary, hepatic,
rheumatologic, autoimmune, or renal disease by history, physical examination, and/or
laboratory studies

- Behavioral, cognitive, or psychiatric disease that in the opinion of the investigator
affects the ability of the participant to understand and cooperate with the
requirements of the study protocol

- Screening laboratory values of Grade 1 or above for absolute neutrophil count (ANC),
alanine aminotransferase (ALT), and serum creatinine, as defined in this protocol

- Any other condition that in the opinion of the investigator would jeopardize the
safety or rights of a participant in the trial or would render the participant unable
to comply with the protocol

- Any significant alcohol or drug abuse in the past 12 months which has caused medical,
occupational, or family problems, as indicated by participant history

- History of a severe allergic reaction or anaphylaxis

- Severe asthma (emergency room visit or hospitalization within the last 6 months)

- HIV infection, by screening and confirmatory assays

- Hepatitis C virus (HCV) infection, by screening and confirmatory assays

- Hepatitis B virus (HBV) infection, by hepatitis B surface antigen (HBsAg) screening

- Any known immunodeficiency syndrome

- Use of anticoagulant medications

- Use of corticosteroids (excluding topical or nasal) or immunosuppressive drugs within
28 days prior to or following vaccination. Immunosuppressive dose of corticosteroids
is defined as greater than or equal to 10 mg prednisone equivalent per day for
greater than or equal to 14 days.

- Receipt of a live vaccine within 28 days or a killed vaccine within the 14 days prior
to vaccination or anticipated receipt of any vaccine during the 28 days following
vaccination

- Asplenia

- Receipt of blood products within the past 6 months, including transfusions or
immunoglobulin or anticipated receipt of any blood products or immunoglobulin during
the 28 days following vaccination

- History or serologic evidence of previous dengue virus infection or other flavivirus
infection (e.g., yellow fever virus, St. Louis encephalitis virus, West Nile virus)

- Previous receipt of a flavivirus vaccine (licensed or experimental)

- Anticipated receipt of any investigational agent in the 28 days before or after
vaccination

- Participant has definite plans to travel to a dengue endemic area during the study

- Refusal to allow storage of specimens for future research

Inclusion Criteria for Second Vaccine:

- Good general health as determined by physical examination and review of medical
history

- Available for the duration of the study, approximately 26 weeks after the second dose

- Willingness to participate in the study as evidenced by signing the informed consent
document

- Females Only: Female participants of childbearing potential willing to use effective
contraception for the duration of the trial. Reliable methods of contraception
include: hormonal birth control, condoms with spermicide, diaphragm with spermicide,
surgical sterilization, intrauterine device, and abstinence (6 months or longer since
last sexual encounter). All female participants will be considered having
childbearing potential except for those with hysterectomy, tubal ligation, tubal coil
(at least 3 months prior to vaccination), or post-menopausal status documented as at
least 1 year since last menstrual period.

Exclusion Criteria for Second Vaccine:

- Anaphylaxis or angioedema following the first dose of vaccine

- Females Only: Currently pregnant, as determined by positive beta-HCG test,
breastfeeding

- Evidence of clinically significant neurologic, cardiac, pulmonary, hepatic,
rheumatologic, autoimmune, or renal disease by history, physical examination, and/or
laboratory studies

- Behavioral, cognitive, or psychiatric disease that in the opinion of the investigator
affects the ability of the participant to understand and cooperate with the
requirements of the study protocol

- Any other condition that in the opinion of the investigator would jeopardize the
safety or rights of a participant in the trial or would render the participant unable
to comply with the protocol

- Any significant alcohol or drug abuse in the past 12 months which has caused medical,
occupational, or family problems, as indicated by participant history

- History of a severe allergic reaction or anaphylaxis

- Severe asthma (emergency room visit or hospitalization within the last 6 months)

- HIV infection, by screening and confirmatory assays

- HCV infection, by screening and confirmatory assays

- HBV infection, by HBsAg screening

- Any known immunodeficiency syndrome

- Use of anticoagulant medications

- Use of corticosteroids (excluding topical or nasal) or immunosuppressive drugs within
42 days prior to or following vaccination. Immunosuppressive dose of corticosteroids
is defined as greater than or equal to 10 mg prednisone equivalent per day for
greater than or equal to 14 days.

- Receipt of a live vaccine within 28 days or a killed vaccine within the 14 days prior
to vaccination or anticipated receipt of any vaccine during the 28 days following
vaccination

- Asplenia

- Receipt of blood products within the past 6 months, including transfusions or
immunoglobulin or anticipated receipt of any blood products or immunoglobulin during
the 28 days following vaccination

- Anticipated receipt of any other investigational agent in the 28 days before or after
vaccination

- Participant has definite plans to travel to a dengue endemic area during the study

- Refusal to allow storage of specimens for future research

Other Treatments and Ongoing Exclusion Criteria:

The following criteria will be reviewed on Study Days 28 and 56 following each
vaccination. If any become applicable during the study, the participant will not be
included in further immunogenicity evaluations, as of the exclusionary visit. The
participant will, however, be encouraged to remain in the study for safety evaluations for
the duration of the study.

- Use of any investigational drug or investigational vaccine other than the study
vaccine during the 28-day period post-vaccination

- Chronic administration (greater than or equal to 14 days) of steroids (defined as
prednisone equivalent of greater than to equal to 10 mg per day), immunosuppressants,
or other immune-modifying drugs initiated during the 28-day period post-vaccination
(topical and nasal steroids are allowed)

- Receipt of a licensed vaccine during the 28-day period post-vaccination

- Receipt of immunoglobulins and/or any blood products during the 28-day period
post-vaccination

- Pregnancy