Background: The World Health Organization recommends intradermal (ID) administration of rabies vaccine for preexposure prophylaxis.
Methods: In a randomized trial in adults assigned to 1 of 6 treatment groups (ID vs intramuscular [IM], 2 vs 3 doses, and controls), rabies neutralizing antibody titers were measured to 1 year postvaccination.
Results: ID vaccination produced acceptable antibody levels in all subjects (2- and 3-dose groups). At day 365, acceptable levels were 40% for IM and 50% for ID 2-dose schedule, and 70% for IM and 60% for ID 3-dose schedule.
Conclusions: ID rabies vaccination induces acceptable antibody titers at a fraction of the dose.
Clinical trials registration: NCT02374814.
Keywords: immunogenicity; intradermal; intramuscular; rabies; vaccine.
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