Test characteristics of two rapid antigen detection tests (SD FK50 and SD FK60) for the diagnosis of malaria in returned travellers

Table 3 Line intensity consensus readings for the FK50 according to parasite densities

	Line intensity readings, numbers of samples*
Result by microscopy	Negative	Faint	Weak	Medium	Strong	Total
P. falciparum
All samples combined, total	22	4	94	66	141	327
Samples with only gametocytes	3	1	8	4	1	17
Asexual parasite density 0–100/μl	12	2	32	9	2	57
Asexual parasite density 101–200/μl	3		21	8	3	35
Asexual parasite density 201–1000/μl	4	1	28	28	20	81
Asexual parasite density > 1000/μl			5	17	115	137
Other species and no parasites seen, total	118	4	3			125
No parasites seen	91	3	1			95
P. vivax	13					13
P. ovale	11					11
P. malariae	3	1	2**			6

* Total number of samples = 452, including two P. falciparum/P. ovale and one P. falciparum/P. malariae mixed infections (allocated under P. falciparum) and one P. vivax/P. malariae mixed infection (allocated under P. vivax)
**PCR confirmed microscopic diagnosis for all discordant samples except for one sample that was diagnosed as a mixed P. malariae/P. falciparum infection

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