In fact, the week-long rabies series is only for people who have never been inoculated. I was given a prophylactic three-shot series during Peace Corps Morocco training in 2006. Thus in my case only a booster shot was necessary.
Just in case anyone is interested, Dr. Stamboulian turned out to be a very good option. In Argentina a rabies inoculation requires a consultation with a medico and a prescription. The visit to the Stramboulian Bario Norte office was 150 pesos and booster shot the at the Pacheco de Melo facility was another 50 - a pretty good deal in my view, especially since the doctor discovered a secondary bacterial infection that I didn't even know was there. That was a definitely a skanky little coati...