Table 2. Effectiveness of Hib conjugate vaccine against meningitis outcomes among children aged 0–59 months, Uganda, 2001–2006.

Vaccine dosesa	Vaccine effectiveness against meningitis outcomeb % (95% confidence interval)
	Confirmed Hib	Purulentc CSF of unknown cause	CSF with 20–99 WBC/µl of unknown cause
1	63 (0–86)	60 (21–80)	38 (-54–75)
2	93 (42–99)	36 (-10–63)	66 (-10–90)
3	94 (48–99)	68 (46–81)	15 (-51–52)
1 or more	65 (41–79)	38 (23–50)	31 (3–51)
2 or more	93 (69–99)	53 (11–68)	35 (-11–62)

CSF, cerebrospinal fluid; Hib, Haemophilus influenzae type b; WBC, white blood cells.
^a Values for 1, 2, 3 and 2+ vaccine doses were documented in immunization cards; values for 1+ doses also included a verbal report.
^b All vaccine effectiveness estimates adjusted for age.
^c CSF that was visually cloudy or had ≥ 100 white blood cells (WBC)/µl.