Please visit this site to read about the Rabies Challenge Fund, help the cause by making a donation.
About the Rabies Challenge Fund
They are raising money to conduct a 5 and 7 year study. Here is an excerpt from the site about the organization:
The Rabies Challenge Fund Charitable Trust will determine the duration of immunity conveyed by rabies vaccines. The goal is to extend the required interval for rabies boosters to 5 and then to 7 years. This project depends primarily upon grassroots gifts for funding the costs of conducting the requisite vaccine trials. Our contributions to date have come mostly from kennel clubs and private individuals. The Challenge fund is a federally registered 501(c)(3) charitable organization [Fed. EIN # 84-6390682].