Table 2. Data derived from Fajara, Western Region studies.

Ref.	Location	Year	Population & (person-years) denominators	NTS isolates	Pneumococcal isolates	NTS incidence <5 years*	IPD incidence <5 years*	Percentage malaria slides positive	Percentage malaria admissions
[4]	Fajara	1979–84	20000 (115000)	69	38	60	33	n/a	n/a
[12]	Western	1993–95	(64181, 0–3 years)	39†	76‡	36§	70∥	n/a	n/a
[13]	Fajara	2003–05	38322 (51096)	5	29	10	57	n/a	n/a
†	Fajara	19821994	n/a	n/a	n/a	n/a	n/a	22%32%
[11]	Fajara	19992001200320052007	n/a	n/a	n/a	n/a	n/a	33%32%22%8%6%	14.5%20.5%17%8.5%5%

Note: * Incidence per 100000 person-years.

†Authors' unpublished data (BG).

‡76/116 (66%) pneumococcal isolates were from blood cultures.

§As estimates of age-specific NTS infection are not available, the incidence of NTS disease is estimated from the ratio of NTS to pneumococcal isolates, 39:76 = 0.51, and the estimated incidence of pneumococcal blood stream infection.

∥Incidence of pneumococcal blood stream infection is calculated from values reported by Usen et al. 1998 [12] and the proportion of IPD due to blood stream infection (0.66), as 0–1 yr: 178×0.66 = 117, 2 yrs: 86×0.66 = 57, 3–4 yrs: extrapolated as half the incidence among those 2 yrs of age; 57/2 = 29, <5 yrs: [(117×2)+57+(29×2)]/5 = 70. § Incidence of NTS disease is calculated as 70×0.51 = 36.