 To study how the immunity is working in the patients system, we will take blood samples before the first injection, then weekly for 10 weeks, on week 12, once a month for a year, and then eventually once a year for fifteen years. These blood samples must be taken at The Methodist Hospital. The total amount of blood that will be obtained is approximately two to three tablespoonfuls, which is considered a safe amount. If the patient has additional injections, blood will be drawn prior to each injection. Additional office visits may be necessary. 