Onchocerciasis transmission in Ghana: the human blood index of sibling species of the Simulium damnosum complex

Lamberton, Poppy H. L.; Cheke, Robert A.; Walker, Martin; Winskill, Peter; Crainey, J. Lee; Boakye, Daniel A.; Osei-Atweneboana, Mike Y.; Tirados, Iñaki; Wilson, Michael D.; Tetteh-Kumah, Anthony; Otoo, Sampson; Post, Rory J.; Basañez, María-Gloria

doi:10.1186/s13071-016-1703-2

Parasites & Vectors

Table 2 Monthly biting rate, human density, human blood index, vector density and vector to human ratio in study villages, Ghana

From: Onchocerciasis transmission in Ghana: the human blood index of sibling species of the Simulium damnosum complex

Region	Village	Season	MBR	Human host density (H)	All trapping techniques			Vector collector-caught flies only
Region	Village	Season	MBR	Human host density (H)	HBI (95 % BCI)	V (95 % BCI)	V/H	HBI (95 % BCI)	V (95 % BCI)	V/H
Brong-Ahafo	Asubende	Dry Feb 2011	2,061	108	0.65 (0.58, 0.71)	39,603 (35,917–44,480)	367 (333–412)	0.70 (0.56, 0.82)	36,712 (31,280–46,497)	340 (290–431)
Brong-Ahafo	Agborlekame	Dry Feb 2011	775	nd	0.33 (0.01, 0.77)	nd	nd	nd	nd	nd
Volta	Asukawkaw Ferry	Wet Aug 2009	nd	5,459	0.40 (0.18, 0.64)	nd	nd	1.00 (0.23, 1.00)	nd	nd
		Dry March 2010	5,777		0.74 (0.68, 0.80)	4,904,478 (4,570,053–5,340,204)	898 (837–978)	0.67 (0.59, 0.74)	5,424,605 (4,893,429–6,151,412)	994 (896–1,127)
		Dry Feb 2011	5,429		0.99 (0.97, 1.00)	3,453,718 (3,419,227–3,551,323)	633 (626–651)	1.00 (0.98, 1.00)	3,410,288 (3,410,288–3,481,386)	625 (625–638)
	Dodi Papase	Wet Aug 2009	nd	5,254	0.86 (0.56, 1.00)	nd	nd	nd	nd	nd
		Dry March 2010	2,357		0.98 (0.94, 1.00)	1,458,110 (1,431,769–1,533,702)	278 (273–292)	0.99 (0.95, 1.00)	1,445,328 (1,427,147–1,522,330)	275 (272–290)
		Dry Feb 2011	4,371		0.98 (0.94, 1.00)	2,701,299 (2,654,646–2,835,194)	514 (505–540)	1.00 (0.97, 1.00)	2,642,575 (2,642,575–2,741,938)	503 (503–522)
	Pillar 83 /Djodji	Wet July 2009	nd	188	nd	nd	nd	nd	nd	nd
		Dry March 2010	7,171		0.69 (0.63, 0.74)	225,288 (209,692–244,864)	1,198 (1,115–1,302)	1.00 (0.98, 1.00)	155,129 (155,129–159,325)	825 (825–847)
		Dry Feb 2011	9,329		0.91 (0.88, 0.93)	222,982 (217,243–230,326)	1,186 (1,156–1,225)	0.98 (0.96, 0.99)	206,089 (203,430–211,314)	1,096 (1,082–1,124)
Western	Bosomase	Wet Aug 2009	5,481	188	0.73 (0.59, 0.85)	162,045 (139,771–203,188)	862 (743–1081)	0.63 (0.42, 0.83)	187,736 (144,996–290,028)	999 (896–1,127)
Western	Bosomase	Dry Feb 2010	1,209	188	0.88 (0.80, 0.95)	29,641 (27,741–33,093)	158 (148–176)	1.00 (0.84, 1.00)	26,154 (26,154–32,700)	139 (139–174)
Ashanti	Gyankobaa	Wet Aug 2009	4,121	274	0.41 (0.37, 0.46)	316,258 (284,223–355,258)	1,154 (1,037–1,297)	0.47 (0.42, 0.53)	276,101 (246,778–312,882)	1,008 (901–1,142)

Abbreviations: MBR monthly biting rate (no. of bites/person/month) as per vector collector (see [13]), HBI human blood index, H human host density, V vector density, V/H vector to human host ratio, nd not determined, BCI Bayesian credible intervals. In all calculations the length of the gonotrophic cycle (g) was assumed to be 3.5 days, expressed in months (3.5 × 12/365 = 0.1151)

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ISSN: 1756-3305

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