From: Individual exposure to Simulium bites and intensity of Onchocerca volvulus infection
SAVANNAH | RAINFOREST | |||||||
---|---|---|---|---|---|---|---|---|
Age/Gender | Row | 50/m | 54/f | 35/m | 60/m | 11/m | 19/f | 63/m |
S.K. | N.A. | O.S. | C.K. | J.D. | P.D. | S.T. | ||
Occupation | nightwatch | farmer | farmer | farmer | school boy | farming | farmer | |
Clothing1 | lss, lt | sk, lss | lss, lt | lss, lt, sh, so | sh | sk, sss | lt, sss | |
Protection by clothing1 (estimate) | 60% | 30% | 60% | 100% | 40% | 30% | 60% | |
Microfilarial load at iliac crest (mf/mg) | 10 | 16 | 25 | 1 | 49 | 149 | 44 | |
Number Simulium landing per day | a | 8 | 4 | 25 | 0 | 269 | 82 | 114 |
proportion of flies that - | ||||||||
- flew away unfed | b | .33 | .33 | .55 | .0 | .64 | .15 | .16 |
- sucked successfully | c | .44 | .07 | .11 | .0 | .31 | .12 | .53 |
- were killed before sucking | d | .0 | .0 | .10 | - | n.d. | n.d. | n.d. |
- were killed after feeding | e | .23 | .60 | .24 | - | n.d. | n.d. | n.d. |
Flies per day on standard fly collector | ||||||||
- caught near the "test-person" | f | 10 | 9 | 21 | 222 | 141 | 157 | 175 |
- caught at the river banc | g | 172 | 40 | 89 | 158 | 202 | 183 | 237 |
Standard daily biting rate (at river)2 | h | 328 | 435 | |||||
Standard daily transmission potential2 | I | 6,6 | 27,8 | |||||
Actual Index of Exposure 3 (AIE) | j | 3% | 6% | 10% | 0% | 89% | 22% | 25% |
Effective Annual Transmission Potential 4 | 365ij | 72 | 144 | 239 | 0 | 9031 | 2232 | 2537 |