Cost-sharing strategies combining targeted public subsidies with private-sector delivery achieve high bednet coverage and reduced malaria transmission in Kilombero Valley, southern Tanzania

Table 2 Net Coverage and locally adjusted estimates of entomological inoculation rates for each sampling cluster.

Cluster	Net coverage				Proportion An. gambiae sensu stricto.^c	Entomological Inoculation Rate (Infectious bites per person per year)
	Ownership^a		Usage^b			ITN non-users^d			ITN Users^e
	(%)	(n)	(%)	(n)		An. gambiae	An. funestus	Total	Total
1	44.0	505	82.8	505	ND	103	83	186	56
2	41.5	514	90.3	444	ND	466	49	515	154
3	36.8	1266	58.3	1249	0.71	1059	67	1127	338
4	26.9	766	48.2	711	0.66	206	40	245	74
5	46.5	1460	53.9	1664	ND	69	93	162	49
6	48.8	790	81.0	797	0.92	115	59	174	52
7	48.2	1008	78.0	1021	0.96	146	16	163	49
8	39.2	409	82.1	409	0.92	191	23	214	64
9	43.1	657	83.5	669	0.69	215	33	248	75
10	38.4	654	86.5	654	ND	358	56	414	124
11	48.7	739	75.9	739	0.37	372	102	474	142
12	52.5	610	85.7	618	0.04	624	85	709	213
13	43.5	170	86.5	177	0.47	568	68	636	191
14	53.9	1283	86.6	1283	0.31	797	54	851	255
15	20.8	454	85.5	469	0.66	383	60	444	133
16	41.8	539	78.3	540	0.85	96	51	147	44
17	44.4	563	73.3	677	0.28	192	20	212	64
18	37.2	332	82.2	332	ND	247	45	291	87
19	41.3	24	77.5	282	0.70	55	20	75	22
20	37.6	477	83.5	478	ND	26	54	80	24
21	12.1	685	30.2	701	0.65	420	29	449	135
22	28.4	263	70.0	263	ND	45	40	85	25
23	42.4	527	70.6	576	0.64	48	52	100	30
24	32.7	1242	72.1	849	ND	404	52	456	137
25	27.1	149	59.9	149	0.53	282	51	333	100
Mean	39.1	643	74.5	650	0.61	299	52	352	105

^a Expressed as the proportion of people sleeping under nets and derived from socioeconomic surveys which included number of members and nets in each household.
^b Expressed as the number of nets per person and derived from routine demographic surveillance system questionnaires which included the numbers of people who slept and slept under a net in each household.
^c Estimated by PCR analysis of An. gambiae sensu lato [77] for all clusters from which 50 samples could be successfully amplified. All samples which were not determined to be An. gambiae sensu stricto were identified as An. arabiensis. ND; Not determined because insufficient numbers of samples (n = 50 in all clusters for which an estimate is available) could be were obtained and successfully amplified.
^d Estimated by fitting mixed linear models of the difference between the log (x+1) of immediate and centres moving averages of biting density (See figure 4), treating cluster as a fixed effect and sample round as a repeated effect (see methods).
^e Calculated as the total EIR experienced by non-users in each cluster adjusted for the estimated 70% personal protection ITNs provide against exposure in Kilombero [69].

ISSN: 1471-2334