Sartori AM., University of Sao Paolo in Sep 2004 found that after give two doses of the varicella vaccine in 41 susceptible HIV-infected childrens in CDC class N1 or A1. Seroconversion occurred in 53% and 60% of vaccines after one and two doses, respectively. No significant fall in CD4 T lymphocytes or increase in HIV viral load at eight weeks after vaccination.