Abstract:
:A dengue virus vaccine candidate, rDEN4Delta30, has been previously reported to be safe and immunogenic in humans, but a subset of vaccinees developed asymptomatic rash, elevation of liver enzymes and/or mild neutropenia. In the current study, mutations that had previously been shown to reduce replication of DEN4 virus in suckling mice and/or in SCID mice engrafted with human liver cells (SCID-HuH-7 mice) were introduced into rDEN4Delta30 in an attempt to further attenuate this virus. Three of the five resulting modified rDEN4Delta30 viruses showed decreased replication in SCID-HuH-7 mice relative to rDEN4Delta30. Moreover, in rhesus monkeys, two of the modified rDEN4Delta30 viruses showed a decrease in replication relative to rDEN4Delta30 while generating levels of neutralizing antibody similar to rDEN4Delta30 virus. All of the modified rDEN4Delta30 viruses completely protected immunized rhesus monkeys from challenge with wild-type DEN4 virus. Based on their attenuation for both human liver cells and rhesus monkeys, two of the modified rDEN4Delta30 vaccine candidates are currently being prepared for use in clinical trials. The application of these attenuating mutations to flavivirus vaccine development is discussed.
journal_name
Vaccinejournal_title
Vaccineauthors
Hanley KA,Manlucu LR,Manipon GG,Hanson CT,Whitehead SS,Murphy BR,Blaney JE Jrdoi
10.1016/j.vaccine.2004.02.031subject
Has Abstractpub_date
2004-09-03 00:00:00pages
3440-8issue
25-26eissn
0264-410Xissn
1873-2518pii
S0264410X04001975journal_volume
22pub_type
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