Pharyngeal Pneumococcal Acquisitions in "Normal" Families: A Longitudinal Study

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Abstract
In a longitudinal study from June, 1965 to June, 1969 in Syracuse, New York, of pneumococcal acquisitions in a population of “normal” families, pneumococci were identified in 4.6% of 19,426 pharyngeal swabs. Serotypes 3 and 19 accounted for 59% of the isolates. The dynamics of acquisitions of types 3 and 19 in each age group were determined by the initial level of resistance, community prevalence, household carriage, and season. In the 5–9-year-old age group, males more often became carriers. Crowding was not found to be a significant factor. While the proportion of individuals resistant to pneumococcal acquisition was related to age, the levels of risk of susceptible individuals did not differ significantly by age. Conversion to resistance occurred in an estimated 42% of type 3, and 32% of type 19 carriers. Those who remained susceptible after carriage were at unchanged risk of reacquisition.

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