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

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

  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
  1. * 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)
  2. **PCR confirmed microscopic diagnosis for all discordant samples except for one sample that was diagnosed as a mixed P. malariae/P. falciparum infection