Abstract
A closely-spaced multisite intradermal regimen of human diploid cell rabies vaccine (HDCV) was evaluated in 39 patients after low-risk exposure to rabies, in comparison to full-dose intramuscular HDCV and sheep brain-derived rabies (Semple) vaccine. The regimen consisted of four intradermal injections, 0.1 ml each of HDCV on days 0, 3 and 7, followed by two booster doses of only 0.1 ml each on days 28 and 91 administered intradermally. Although the total amount of HDCV used in this intradermal regimen was 1.4 ml or one-quarter of the conventional intramuscular regimen, a higher proportion of the recipients of this economical intradermal regimen, as compared to the full-dose intramuscular regimen, developed neutralizing antibodies above the hypothetical protective level of 0.5 iu/ml 7 days after starting immunization. Besides the earlier antibody response, the peak antibody level of the intradermal regimen was also satisfactorily high and not significantly different from that after the intramuscular regimen. Simultaneous administration of inosiplex, an antiviral and immunopotentiating agent, during the first 10 days of intradermal immunization resulted in an even higher antibody response for as long as 91 days. In contrast, but not unexpectedly, Semple vaccine evoked lower, more sluggish and inconsistent antibody responses. The side-effects of intradermal HDCV were mild, mainly local and self-remitting. We therefore recommend our intensive intradermal regimen of HDCV vaccination for safe, effective and economical use in post-exposure rabies immunization.
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Selected References
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