Efficacy of the New CPRV Clinical Trial
Official title:
Immune Response in Adults to Pre-exposure Rabies Vaccination and Simulated Post-exposure Rabies Booster Vaccination With a New Chromatographically Purified Vero-cell Rabies Vaccine(SPEEDA®) : a Randomized Controlled Trial With Purified Vero-cell Rabies Vaccine (PVRV)
Pre exposure rabies vaccination with a new Chromatographically Purified Vero-cell Rabies
Vaccine(SPEEDA) is as effective as Purified Vero-cell Rabies vaccine.
After the pre exposure rabies vaccination with a new Chromatographically Purified Vero-cell
Rabies Vaccine(SPEEDA), the Rabies neutralizing antibodies in all patients on day 42 are 0.5
IU/ml or more.
And Simulated post-exposure rabies booster vaccination with a new Chromatographically
Purified Vero-cell Rabies Vaccine(SPEEDA) is as effective as Purified Vero-cell Rabies
vaccine.
After the simulated post-exposure rabies booster vaccination with a new Chromatographically
Purified Vero-cell Rabies Vaccine(SPEEDA), the Rabies neutralizing antibodies in all
patients on day 14 after the booster are 0.5 IU/ml or more.
Pre-exposure vaccination will be done according to standard protocol. Participants will be
injected with one dose on day 0, 7 and 28. Blood samples will be taken on day 0, 28 and 42
after the first vaccination dose.
360 days later, participants will receive simulated post-exposure rabies booster vaccination
one dose on day 0 and 3. Blood samples will be taken again on day 0(360 days) and 14(374
days) after the booster vaccination.
Rabies neutralizing antibody levels will be measured by Rapid Fluorescent Focus Inhibition
Test(RFFIT). And the levels of 0.5 IU/ml or more is considered acceptable protective level.
For statistical analysis, percentage of subjects achieving seroconversion (defined as RNab ≥
0.5 IU/ mL) are determine at each sampling time. The average of the titer used in this study
is Geometric mean titer(GMT). 95 percent confidence interval(95% CI) of the GMT will be
calculated for each study group from individual measurements of serum rabies antibody levels
at each sampling time. One-way ANOVA would be used to calculated the significance of the
difference between the GMT of three groups, SPEEDA® intradermal injection, SPEEDA®
intramuscular injection and PVRV intramuscular injection. The primary criterion for this
comparison are the rabies antibody value on day 42 (2 weeks after the third vaccine dose of
pre-exposure vaccination) and on day 374(2 weeks after the first vaccine dose of booster
vaccination). Results will be deemed statistically significant at p < 0.05. Safety data
(immediate, local and systemic reactions) were summarized as numbers and percentages.
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Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Prevention