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Table 2 Parameter assumptions used for the comparisons presented in this paper

From: Required duration of mass ivermectin treatment for onchocerciasis elimination in Africa: a comparative modelling analysis

Assumption

ONCHOSIM

EPIONCHO

Life expectancy of adult worms

10 years [38]

10 years [38]

Life expectancy of microfilariae

0.75 years [58]

1.25 years [59]

Distribution of worm survival times

Weibull

Exponential

Proportion of blood meals taken by vectors on humans

0.96 [30] and expert opinion

0.96 (matched to ONCHOSIM)a

Macrofilaricidal effect of ivermectin

Not included

Not included

Microfilaricidal effect of ivermectin

100 %, instantaneous upon administration [36]

98-99 % at 2 mo. post-treatment following [40]

Embryostatic effect of ivermectin

All female worms temporarily stop producing mf but resume production gradually, reaching maximum production capacity 11 months post-treatment on average [36]

Fertile worms exposed to ivermectin decrease their mf production according to the dynamics presented in [40] and would fully recover if further untreated

Cumulative effect on mf production by adult worms

35 % reduction in the rate of mf production per dose, on average [36].

35 % reduction in the rate of mf production per dose [36]a

  1. aDifferent values were applied in previous publications, but for the current model comparison presented in this paper the assumptions were harmonized with those in ONCHOSIM