A study conducted at a preventive clinic in Thiruvananthapuram, Kerala, assessed the antibody response after rabies vaccination among 150 participants. Results indicated that 92.7% had protective antibody levels, with a mean titer of 3.81 IU/ml, and found that five years since the last vaccination is an optimal time for a booster dose. The research noted that antibody levels were generally high regardless of whether the vaccination was intramuscular or intradermal.
Source: Transactions of the Royal Society of Tropical Medicine and Hygiene, https://doi.org/10.1093/trstmh/trag055