Table 1.
Prevalence (%) of helminth parasites in the study population in the first (2005–2008), second (2009–2011), third (2012–2014) periods and overall
| Prevalence (95 % CL) | ||||
|---|---|---|---|---|
| Period 1 2005–2008 (n = 9,208) |
Period 2 2009–2011 (n = 8,844) |
Period 3 2012–2014 (n = 11,234) |
Combinedd
(n = 29,286) |
|
| Four common species | ||||
| Hook worms | 2.05 (1.763–2.342) | 1.38 (1.136–1.623) | 0.42 (0.307–0.556) | 1.22 (1.097–1.348) |
| Trichuris trichiura | 0.49 (0.356–0.654) | 0.42 (0.295–0.577) | 0.13 (0.075–0.220) | 0.33 (0.269–0.404) |
| Ascaris lumbricoides | 0.34 (0.229–0.478) | 0.19 (0.112–0.308) | 0.12 (0.068–0.209) | 0.21 (0.162–0.271) |
| Hymenolepis nana a | 0.10 (0.045–0.186) | 0.19 (0.112–0.308) | 0.15 (0.088–0.242) | 0.15 (0.106–0.198) |
| Above 4 helminth spp. combined | 2.63 (2.301–2.955) | 2.01 (1.720–2.305) | 0.76 (0.604–0.936) | 1.72 (1.575–1.873) |
| Other species | ||||
| Strongyloides sp. | Nd | 0.16 (0.087–0.266) | 0.04 (0.014–0.104) | 0.09 (0.057–0.148) |
| Schistosoma sp. | Nd | 0.06 (0.018–0.132) | 0.07 (0.031–0.140) | 0.06 (0.034–0.111) |
| Taenia sp. | Nd | 0.02 (0.003–0.082) | 0.04 (0.010–0.091) | 0.03 (0.011–0.065) |
| Others combinedb | Nd | 0.03 (0.007–0.099) | 0.04 (0.014–0.104) | 0.04 (0.017–0.079) |
| All helminths combinedc | Nd | 2.23 (1.920–2.535) | 0.93 (0.757–1.113) | 1.50 (1.336–1.672) |
aThis species is also known as Rodentolepis nana
bThis row includes 8 cases of three rarely encountered species, Enterobius vermicularis, Fasciola hepatica and Trichostrongylus sp
cThis row summarises data for periods 2 and 3, but does not include period 1 when some of the helminths were not recorded
dOverall prevalence across periods 1, 2 and 3 combined or periods 2 and 3 combined when relevant data for period 1 were not available
Nd = not done, these species were not assessed independently in the first period