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Table 4 Microfilaraemia in the study communities

From: Lymphatic filariasis control in Tanzania: effect of six rounds of mass drug administration with ivermectin and albendazole on infection and transmission

Study population

Survey no.

Time of survey

Survey population

No. examined (%)

No. positive for mf (%)

Mf GMI* for all examined

Mf GMI* for positives

Kirare

1

Sep-04

530

471 (88.9)

123 (26.1)

4.83

851.1

2

Jan-06

530

461 (87.0)

96 (20.8)

2.46

385.7

3

Jan-07

530

438 (82.6)

69 (15.8)

1.08

101.5

4

Oct-07

530

351 (66.2)

35 (10.0)

0.70

200.3

5

Oct-08

530

302 (57.0)

39 (12.9)

0.90

142.4

6

Oct-09

512

259 (53.5)

13 (5.0)

0.30

194.7

7

Nov-10

690

400 (58.0)#

17§ (4.4)

0.25¤

178.9

 

8

Nov-11

690

393 (57.0)#

11§ (2.7)

0.15¤

180.8

Kiomoni

7

Nov-10

504

386 (76.6)#

18§ (4.7)

0.34¤

423.1

 

8

Nov-11

504

312 (61.9)#

7§ (2.2)

0.16¤

487.3

Kisimatui

7

Nov-10

651

389 (59.8)#

34§ (8.7)

0.55¤

159.1

 

8

Nov-11

651

367 (56.4)#

24§ (6.5)

0.33¤

77.2

  1. Results shown are for two hamlets of Kirare (Mtambuuni, Mashine) in survey 1-8, as well as for one hamlet of Kiomoni (Mabavu) and one hamlet of Kisimatui (Majengo) in survey 7 and 8. Results from all four hamlets of Kirare in survey 1-5 are given in [6].
  2. * Geometric mean intensity, in mf/ml blood.
  3. # Number (%) examined for CFA. In survey 7 and 8, the “number of CFA positives/number of CFA positives examined for mf/number of mf positives detected” were 101/89/15 and 77/65/9 for Kirare, 74/68/17 and 52/52/7 for Kiomoni and 110/91/28 and 84/63/18 for Kisimatui, respectively.
  4. § Expected number of mf positives among those examined for CFA. Calculated as [number positive for CFA] × [number positive for mf] / [number CFA positives examined for mf].
  5. ¤ Expected mf GMI among those examined for CFA. See Methods for calculation.