Patterns of geohelminth infection, impact of albendazole treatment and re-infection after treatment in schoolchildren from rural KwaZulu-Natal/South-Africa

Table 3 Development of prevalence and intensity after one and after two rounds of treatment with 400 mg albendazole*

	Post-Treatment 1^‡	Re-infection 1	Post-Treatment 2^‡	Re-infection 2a	Re-infection 2b
n =	801	790	803	739	731
Time of survey	May/Jun 98	Aug 98	Oct/Nov 98	Feb 99	Apr/May 99
Weeks since last treatment	3	16	3	18	29
Prevalence (%)
Hookworm	21.2	24.8	10.1	24.6	36.7
A. lumbricoides	1.0	4.3	0.7	3.0	8.6
T. trichiura	54.6	50.9	44.0	44.8	43.4
Mean intensity (EPG)^†
Hookworm	77	184	14	65	139
A. lumbricoides	55	115	3	59	351
T. trichiura	227	215	116	174	175

* Included are all pupils who participated in both treatments (n = 864) and in the respective survey (n given in table). Calculated using both samples that were obtained in each survey. ^† Arithmetic mean EPG for all pupils including uninfected. ^‡ The two treatments were administered in April and October 1998 respectively.

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