an average atp of 100 larvae or less in the head , thorax and abdomen of the flies was associated with an onchocerciasis prevalence of 50 to 60 % , a mean microfilarial density below 40 microfilariae per skin-snip , less than 5 % of ocular lesions , and no onchocercal blindness .
C0018670
head
C0015392
ocular