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Table 1 Comparison of PCR and expert laboratory microscopy for active malaria surveillance.

From: Comparison of PCR and microscopy for the detection of asymptomatic malaria in a Plasmodium falciparum/vivax endemic area in Thailand

Expert microscopy resμlt No. of samples with the following result by PCR (% of total in row)
P. falciparum P. vivax P. malariae P. ovale Mixed Negative Total
P. falciparum 102 (38.4%) 13 (4.9%) 0 (0.0%) 0 (0.0%) 7 (2.7%) 143 (54.0%) a 265
P. vivax 4 (1.0%) 131 (33.9%) 1 (0.3%) 0 (0.0%) 8 (2.1%) 242 (62.7%) b 386
P. malariae 0 (0.0%) 0 (0.0%) 8 (80.0%) 0 (0.0%) 0 (0.0%) 2 (20.0%) 10
Mixed 3 (75.0%) 0 (0.0%) 0 (0.0%) 0 (0.0%) 1 (25.0%) 0 (0.0%) 4
Negative 70 (0.9%) 214 (2.7%) 7 (0.1%) 2 (<0.1%) 18 (0.2%) 7,614 (96.1%) 7,925
Total 179 (2.1%) 358 (4.2%) 16 (0.2%) 2 (<0.1%) 34 (0.40%) c 8,001 (93.1%) 8,590
  1. a 98% (140/143) of microscopy-positive P. falciparum samples that were PCR negative had <250 parasites/μl.
  2. b 99% (239/242) of microscopy-positive P. vivax samples that were PCR negative had <250 parasites/μl.
  3. c Includes the following mixed infections: 28 P. falciparum/P. vivax, 3 P. vivax/P. ovale, 2 P. vivax/P. malariae and 1 P. falciparum/P. malariae.