Highlights a study by T. Vesilkari, et al, that tested the Oka-RIT strain of live attenuated varicella vaccine at dose levels of 5300 PFU (high titre) and 200 0 PFU (low titre) in 13-17-month-old children. Study methods and results; Comparison with the varicella vaccine alone and with a measles-mumps-rubella (MMR) vaccine.