- Infants starting vaccination with 13vPnC in the first 6 months of life who are
members of the Northern California Kaiser Permanente healthcase system and who
receive at least 1 dose of 13vPnC during the study observation period will be
included. Infants must not have had 7vPnC at the time of 13vPnC dose administration.
- Infants and children who were previously vaccinated with any number of doses of 7vPnC
will be excluded.