Evidence of suppression of onchocerciasis transmission in the Venezuelan Amazonian focus

Parasites & Vectors

Table 4 Biting rate, infectivity rate, mean number of O. volvulus L3 per fly, and transmission potentials of S. guianense s.l. in the baseline and pre-ivermectin MDA period (1981–2000) in two sentinel communities of the Amazonian focus of southern Venezuela

Community (years)	L3-positive/dissected	MBR ^a (95 % CI)	SBR ^b (95 % CI)	Infectivity rate (%) (95 % CI)	No. L3/fly (range)	MTP ^c (range)	STP ^d	ATP ^e
Koyowë (1982–2000)	108/29,490	20,420 (16,843–23,997)	103,516 (81,142–125,889)	0.37 (0.30–0.44)	0.0079 (0.001–0.036)	179 (14–576)	1406	2020
Niayopë^f (1982–1993)	31/4742	727 (417–1036)	2920 (2538–3301)	0.65 (0.44–0.93)	0.0143 (0.001–0.036)	6 (0–15)	40	72

^a MBR: Monthly biting rate = arithmetic mean number of bites per person per month
^b SBR: Seasonal biting rate = the number of bites per person per transmission season (January–March plus October–November)
^c MTP: Monthly transmission potential = number of L3 per person per month = MBR × mean number of L3 per fly (located anywhere in the fly’s body)
^d STP: Seasonal transmission potential = the sum of MBR for the months with higher transmission (January–March plus October–November) with L3 larvae located anywhere in the fly’s body
^e ATP: Annual transmission potential = number of L3 per person per year = the sum of MBR values throughout the year with L3 larvae located anywhere in the fly’s body
^fThe community of Niayopë was formerly called Niyayowë

ISSN: 1756-3305