Testing of novel dengue virus 2 vaccines in African green monkeys: safety, immunogenicity, and efficacy.
The immunogenicity and safety of three novel host-range vaccines containing deletions in the transmembrane domain of dengue virus serotype 2 (DV2) E glycoprotein were evaluated in African green monkeys. The shorter transmembrane domains are capable of functionally spanning an insect but not a mammalian cell membrane, resulting in production of viral mutants that have reduced infectivity in mammalian hosts but efficient growth in insect cells. Groups of four monkeys received one dose each of test vaccine candidate with no booster immunization. After immunization, levels of viremia produced by each vaccine were determined by infectious center assay. Vaccine recipient immune response to wild-type DV2 challenge was measured on Day 57 by enzyme-linked immunosorbent assay and plaque reduction neutralization test. Two vaccines, DV2ΔGVII and DV2G460P, generated neutralizing antibody in the range of 700-900 50% plaque reduction neutralization test units. All three vaccine strains decreased the length of viremia by at least two days. No safety concerns were identified.
Katherine M
KM
Smith
Kavita
K
Nanda
Carla J
CJ
Spears
Amanda
A
Piper
Mariana
M
Ribeiro
Michelle
M
Quiles
Caitlin M
CM
Briggs
Gwynneth S
GS
Thomas
Malcolm E
ME
Thomas
Dennis T
DT
Brown
Raquel
R
Hernandez
Victoria
V
McCarl
D000818:Animals; D057134:Antibodies, Neutralizing / Q000097:blood; D000914:Antibodies, Viral / Q000097:blood; D002478:Cells, Cultured; D002522:Chlorocebus aethiops; D003715:Dengue / Q000276:immunology / Q000517:prevention & control* / Q000821:virology; D053059:Dengue Vaccines / Q000009:adverse effects / Q000235:genetics / Q000276:immunology / Q000627:therapeutic use; D003716:Dengue Virus / Q000235:genetics / Q000276:immunology*; D007114:Immunization; D009500:Neutralization Tests; D014759:Viral Envelope Proteins / Q000235:genetics / Q000276:immunology; D010948:Viral Plaque Assay
D057134:Antibodies, Neutralizing; D000914:Antibodies, Viral; D053059:Dengue Vaccines; C051821:E-glycoprotein, Dengue virus type 2; D014759:Viral Envelope Proteins