Table 1.

Acquisitions Rates of Serotypes

Serotype	Acquisitions	Incidence (per 1000 days)	95% CI	Incidence in larger cohorta (per 1000 days)
6A	45	1.33	0.97–1.77	1.49
6B	38	1.12	0.79–1.54	1.26
14	26	0.77	0.50–1.12	0.79
19F	74	2.18	1.71–2.74	2.54
23F	35	1.03	0.72–1.44	1.24

The total time at risk was 33,905 person-days.

Abbreviation: CI, confidence interval.

^aThe incidence estimated from the cohort of 1400 that included all newborns; those who gave and those who did not give serum samples.