Table 1.

Outcome of Children 12 Months to 12 Years of Age Given Two Lots of Oka/Merck Varicella Vaccine and Followed Prospectively

Research LotProduction Lots
Year vaccinated1984 to 19851987 to 1988
No. of seronegative vaccinees by FAMA143138
No. of failures to seroconvert39
Percent seroconversion97.993.5
No. of seroconverters137129
No. of years followed by phone surveillance106
No. of cases of chickenpox2522
Cumulative percent with chickenpox16.817.1
Annual percent with chickenpox1.72.8