i was bitten by a dog last year and i injected 4 needles of rabies vaccine in the way of 2-1-1,then 6months later,i was bitten again,then the doctor asked me to inject another 2 needles of rabies vaccine on the day which i was injuried and the 3rd day after the injury.the date of the last injection was January10,2018,from that day on,how long can the vaccine protect me?still 6 months?