Table 1.

Carriage rate of resistant Escherichia coli isolates due to TMP-SMX prophylaxis.

Months of follow up	Resistance Carriage rate
	Cross sectional Study			Control Study
	N	Freq	%	Case			Control
				N	Freq	%	N	Freq	%
0	200	108	54.0	200	108	54.0	120	35	29.2
3	100	89	89.0	195	152	77.9	119	33	27.7
6	100	97	97.0	180	173	96.1	111	34	30.6
9	100	99	99.0	161	161	100	100	51	51.0
12	100	99	99.0	151	151	100	100	53	53.0

N = total number