17. Positivity for HIV, active CMV, chlamydia, any evidence of serious fungal infection, active HSV1and/or HSV2 (determined as IgM positivity of 2 standard deviations higher than the highest value of the test reference range), hepatitis B or C, at screening. Minor skin fungus, or minor candidiasis is not an enrollment or treatment exclusion criterion. Also, with the exception of HIV history, hepatitis B and C, successfully-treated, disease-free individuals (> 6 months between time of successful treatment confirmation and time at screening) would be eligible for enrollment in this trial.