Baseline prevalence and intensity of schistosomiasis at sentinel sites in Madagascar: Informing a national control strategy

Table 1 Study population characteristics, schistosomiasis and STHs in 29 sentinel sites in the Western half of Madagascar

Study population characteristic and infection	n (%), mean (95 % CI)
Gender
Male	915 (46.7)
Female	1,043 (53.3)
Age
7 years	532 (27.2)
8 years	495 (25.3)
9 years	474 (24.2)
10 years	457 (23.3)
School attendance
Regular	1,606 (82.0)
Not regular	352 (18.0)
Schistosomiasis
Any schistosomiasis	684 (35.3)
S. haematobium infection	594 (30.5)
S. haematobium heavy-intensity infection	294 (15.1)
Mean S. haematobium egg count	62.2 (95 % CI 49.0–75.3)
S. mansoni infection	97 (5.0)
S. mansoni heavy-intensity infection	17 (0.9)
Mean S. mansoni egg count	14.2 (95 % CI 7.7–20.6)
Mixed schistosome infection	7 (0.5)
Soil-transmitted helminth (STH) infections
Any STH infection	90 (4.7)
A. lumbricoides infection	86 (4.4)
Mean A. lumbricoides egg count	116.8 (95 % CI 58.9–174.7)
T. trichiura infection	43 (2.2)
Mean T. trichiura egg count	1.0 (95 % CI 0.3–1.6)
Hookworm infection	62 (3.2)
Mean hookworm egg count	2.3 (95 % CI 0.9–3.7)

School attendance = as reported by the head teacher of the respective school; S. haematobium infection = Schistosoma haematobium eggs identified by urine filtration; prevalence of heavy-intensity S. haematobium infection = >50 S. haematobium eggs per 10 mL of urine; S. mansoni infection = S. mansoni eggs identified by duplicate Kato-Katz slides; prevalence of heavy-intensity S. mansoni infection = >399 S. mansoni eggs per gram of stool (epg); mean (95 % CI) = arithmetic mean (95 % confidence interval); A. lumbricoides infection = A. lumbricoides eggs identified by duplicate Kato-Katz slides; prevalence of heavy-intensity A. lumbricoides infection = >49,999 A. lumbricoides epg of stool; Trichuris trichiura infection = T. trichiura eggs identified by duplicate Kato-Katz slides; prevalence of heavy-intensity T. trichiura infection = >9,999 T. trichiura epg of stool; Hookworm infection = hookworm eggs identified by duplicate Kato-Katz slides; prevalence of heavy-intensity hookworm infection = >3,999 hookworm epg of stool

ISSN: 1756-3305