Table 2.

Prevalence of pfmdr1 copy number in isolates collected from malaria patients with sensitive, re-infection, and recrudescence (before treatment and at the time of reappearance) responses, Thailand^*

Pfmdr1 copy number	Treatment outcome, no. (%)
	Sensitive† (n = 87)	Failure (n = 30)
		Re-infection (n = 9)	Recrudescence‡
			Pre-treatment (n = 21)	Post-treatment (n = 18)
1	64 (73.6)	8 (88.9)	12 (57.1)	4 (22.2)
2	12 (13.8)	1 (11.1)	2 (9.5)	2 (11.1)
3	7 (8.0)	0 (0.0)	1 (4.8)	4 (22.2)
4	4 (4.6)	0 (0.0)	3 (14.3)	5 (27.8)
5	0 (0.0)	0 (0.0)	1 (4.8)	0 (0)
6	0 (0.0)	0 (0.0)	2 (9.5)	2 (11.1)
7	0 (0.0)	0 (0.0)	0 (0.0)	0 (0)
8	0 (0.0)	0 (0.0)	0 (0.0)	1 (5.6)

^*Pfmdr1 = P. falciparum multidrug resistance 1.

^†Statistically significant difference from pre-treatment recrudescence (P = 0.007).

^‡Statistically significant difference between pre-treatment and post-treatment recrudescence (P = 0.007).