Table 4. Chronological evolution of intensity of infection and egg reduction rates (ERRs).

Time of observation	Among those sampled at baseline (n = 437)		Among those treated at baseline (n = 90)		Among those positive at 1st follow-up (n = 20)
	Mean epg	ERR	Mean epg	ERR	Mean epg	ERR
Baseline	72.9	–	264.3	–	585.4	–
1st follow-up	7*	90.3%	33.9	87.2%	152.4	74%
2nd follow-up	0.1*	99.9%	0.5	99.8%	24	84.2%

^*As children negative at baseline were not followed up, calculations are based on the assumption that all of them remained negative at 1^st and 2^nd follow-up.