Chimeric Live, Attenuated Vaccine against Japanese Encephalitis (ChimeriVax‐JE): Phase 2 Clinical Trials for Safety and Immunogenicity, Effect of Vaccine Dose and Schedule, and Memory Response to Challenge with Inactivated Japanese Encephalitis Antigen
2003; Oxford University Press; Volume: 188; Issue: 8 Linguagem: Inglês
10.1086/378356
ISSN1537-6613
AutoresThomas P. Monath, Farshad Guirakhoo, Richard Nichols, Sutee Yoksan, Robert Schrader, Chris Murphy, Paul S. Blum, Stephen Woodward, Karen McCarthy, Danell Mathis, Casey Johnson, Philip Bedford,
Tópico(s)Viral Infections and Vectors
ResumoChimeriVax-JE is a live, attenuated vaccine against Japanese encephalitis, using yellow fever (YF) 17D vaccine as a vector. In a double-blind phase 2 trial, 99 adults received vaccine, placebo, or YF 17D vaccine (YF-VAX). ChimeriVax-JE was well tolerated, with no differences in adverse events between treatment groups. Viremias resulting from administration of ChimeriVax-JE and YF-VAX were of short duration and low titer; 82 (94%) of 87 subjects administered graded doses (1.8–5.8 log10) of ChimeriVax-JE developed neutralizing antibodies. A second dose, administered 30 days later, had no booster effect. Previous inoculation with YF did not interfere with ChimeriVax-JE, but there was a suggestion (not statistically significant) that ChimeriVax-JE interfered with YF-VAX administered 30 days later. A separate study explored immunological memory both in subjects who had received ChimeriVax-JE 9 months before and in ChimeriVax-JE–naive subjects challenged with inactivated mouse-brain vaccine (JE-VAX). Anamnestic responses were observed in preimmune individuals. ChimeriVax-JE appears to be a safe vaccine that provides protective levels of neutralizing antibody after a single dose
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