Hello Mrs Gupta,
According to the World Health Organization, the person who has previously received a complete course of primary immunization
(pre- or post-exposure) should receive two doses of Rabipur; one on each of days 0 and 3, respectively. This is independent of the interval to the last immunization.
So, as your son has previously taken a complete course of Rabipur, this time he needs to take only 2 injections.
Wishing him a Good Health.
Thanks & take care.