Table 5.
Summary of black fly collection and dissection data from catches made at Nachtigal and Essougli
| July | August | September | October | November | December | January | February | March | April | May | June | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nachtigal | ||||||||||||
| Number of days | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Total black fly catch | 3184 | 1149 | 6370 | 11,247 | 6106 | 1096 | 2470 | 3333 | 3489 | 2871 | 6448 | 4522 |
| Number dissected (%) | 480 (15.1) | 252 (21.9) | 372 (5.8) | 313 (2.8) | 508 (8.3) | 265 (24.2) | 466 (18.9) | 425 (12.8) | 379 (10.9) | 370(12.9) | 276 (4.3) | 318 (7.0) |
| Number parous (%)a | 165 (34.4) | 47 (18.7) | 38 (10.2) | 68 (21.7) | 43 (8.5) | 13 (4.9) | 50 (10.7) | 82 (19.3) | 77 (20.3) | 93 (25.1) | 25 (9.1) | 40 (12.6) |
| Number infected (%)a | 1 (0.2) | 3 (1.2) | 2 (0.2) | 0 (0) | 4 (0.8) | 0 (0) | 2 (0.4) | 1 (0.2) | 1 (0.3) | 0 (0) | 0 (0) | 0 (0) |
| Number with L3 (%)a | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 2 (0.4)b | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) |
| Monthly biting rate | 32,901 | 11,873 | 63,700 | 116,219 | 61,060 | 11,325 | 25,523 | 31,108 | 36,053 | 28,710 | 66,629 | 45,220 |
| Monthly transmission potential | 0 | 0 | 0 | 0 | 0 | 0 | 1479 | 0 | 0 | 0 | 0 | 0 |
| Essougli | ||||||||||||
| Number of days | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Total black fly catch | 1262 | 993 | 6160 | 13,906 | 2400 | 1089 | 947 | 1114 | 1325 | 1504 | 2127 | 3066 |
| Number dissected | 399 (31.6) | 167 (16.8) | 410 (6.7) | 321 (2.3) | 381 (15.9) | 231 (21.2) | 215 (22.7) | 182 (16.3) | 213 (16.1) | 331 (22) | 312 (14.7) | 372 (12.1) |
| Number (%) parousa | 83 (20.8) | 31 (18.6) | 54 (13.2) | 49 (15.3) | 44 (11.5) | 20 (8.7) | 14 (6.5) | 13 (7.1) | 48 (22.5) | 45 (13.6) | 31 (9.9) | 40 (10.8) |
| Number infected (%)a | 2 (0.5) | 3 (1.8) | 0 (0) | 1 (0.3) | 2 (0.5) | 1 (0.4) | 2 (0.9) | 0 (0) | 1 (0.5) | 2 (0.6) | 1 (0.3) | 0 (0) |
| Number (%) with L3a | 0 (0) | 1 (0.6) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | 1 (0.5) | 0 (0) | 1 (0.3) | 0 (0) |
| Monthly biting rate | 13,041 | 10,261 | 61,600 | 143,695 | 24,000 | 11,253 | 9786 | 10,397 | 13,692 | 15,040 | 21,979 | 30,660 |
| Monthly transmission potential | 0 | 50 | 0 | 0 | 0 | 0 | 0 | 0 | 58 | 0 | 74 | 0 |
aCalculations based only on dissected black flies, not on total number of black flies caught
bOf these two infected black flies, one had 4 L3 larvae and the other had 14 L3 larvae (total of 18 L3 larvae in the heads of the two black flies)