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Table 1 Demographic characteristics of the study participants, parasite density, asymptomatic and submicroscopic Plasmodium infections during the 4 cross-sectional surveys

From: Asymptomatic and submicroscopic Plasmodium infections in an area before and during integrated vector control in Homa Bay, western Kenya

Variable

Survey period

Feb 2018

(dry season)

June 2018

(wet season)

Feb 2019

(dry season)

June 2019 (wet season)

Age group (yrs.) n (%)

    

 < 5

96 (15.7)

139 (18.9)

163 (22.6)

144 (17.0)

 5–14

210 (34.4)

285 (38.7)

250 (34.7)

260 (30.6)

 ≥ 15

304 (49.8)

313 (42.5)

307 (42.6)

445 (52.4)

Microscopic malaria parasite prevalence % (n)

18.5 (113/610)

14.2 (105/737)

3.3 (24/720)

1.3 (11/849)

Malaria parasite prevalence by qPCR % (n)

37.4 (228/610)

25.1 (185/737)

10.4 (75/720)

6.7 (57/849)

Geometric mean parasite density (parasites/µl of blood)

2229

353

578

184

Plasmodium falciparum parasite density category % (N)

100% (113)

100% (102)

100% (24)

100% (11)

Low % (n)

33.6 (38)

77.8 (77)

58.3 (14)

90.9 (10)

Moderate % (n)

36.3 (41)

19.2 (19)

41.7 (10)

9.1 (1)

High % (n)

27.4 (31)

3.0 (3)

0.0 (0)

0.0 (0)

Hyper % (n)

2.7 (3)

(0)

0.0 (0)

0.0 (0)

  1. Low  < 1000 parasites/µL, moderate 1000–4999 parasites/µL, high 5000–99,999 parasites/µL, hyperparasitaemia ≥ 100,000 parasites/µL