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Table 1 Relationship between the Prevalence of Onchocerca volvulus microfilariae and Onchocerca Skin Disease (OSD) among the Residents of Hawal River Valley

From: Epidemiology and psycho-social aspects of onchocercal skin diseases in northeastern Nigeria

  Males Females Both Sexes
Age Group No. Exam No. mf +ve No. OSD +ve No. Exam No. mf +ve No. OSD +ve No. Exam No. mf +ve No. OSD +ve
(Years) (No. SS) (%) (%) (No. SS) (%) (%) (No. SS) (%) (%)
≤ 10 461(114) 18(15.8) 169(36.7) 417(89) 13(14.6) 153(14.6) 878(203) 31(15.3) 322(36.7)
11 20 447(108) 19(17.6) 184(41.2) 454(111) 20(18.0) 181(39.9) 901(219) 39(17.8) 365(40.5)
21 – 30 523(127) 26(20.5) 220(42.1) 461108) 19(19.6) 198(41.0) 984(235) 45(19.1) 409(41.6)
31 – 40 556(142) 30(21.1) 285(51.3) 450(124) 26(19.8) 231(51.3) 1006(266) 56(21.1) 516(51.3)
41 – 50 548(150) 31(20.7) 265(48.4) 498(131) 26(19.8) 230(46.2) 1046(281) 57(20.3) 495(47.3)
≥ 51 507(137) 28(20.7) 223(44.0) 522(140) 25(17.9) 228(43.7) 1029(275) 53(19.3) 451(43.8)
Total 1042(776) 152(19.6) 1346(44.2) 2802(703) 129(18.3) 1212(43.3) 5844(1479) 281(19.0) 2558(43.8)
  No. SS = No. Skin Snipped    mf+ve = Microfilari positive