No. of days after first day of isolation
Antimicrobial agent	Years	0	1–3	4–6	7–9	10–12	13–15
Co-amoxiclav	1996–1997	5%	7%	7%	8%	6%	6%
	2001–2002	9%	15%	24%	32%	35%	35%
Ceflazidime/Cefotaxime	1996–1997	3%	3%	2%	1%	5%	2%
	2001–2002	7%	15%	20%	33%	36%	40%
Gentamicin	1996–1997	5%	6%	7%	8%	7%	3%
	2001–2002	9%	21%	28%	37%	43%	41%
Cotrimoxazole	1996–1997	8%	12%	19%	14%	19%	21%
	2001–2002	13%	22%	32%	45%	41%	48%
Ciprofloxacin	1996–1997	2%	3%	4%	1%	6%	8%
	2001–2002	7%	14%	19%	31%	35%	35%
No of isolates (min–max)	1996–1997	1111–1535	140–196	94–134	66–111	46–63	35–58
	2001–2002	1416–1567	212–252	133–161	99–128	80–101	67–82