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Table 4 Relationship between parasite density and positive tests by nested PCR of saliva and urine samples from malaria patients with single infections.

From: Comparative detection of Plasmodium vivax and Plasmodium falciparum DNA in saliva and urine samples from symptomatic malaria patients in a low endemic area

Specimen Parasites/μl No. positives/Total positives by blood PCR (%)
   P. falciparum P. vivax
Saliva    
  <1,000 5/7 (71.4) 2/3 (66.7)
  >1,000 25/34 (73.5) 30/33 (90.9)
  >5,000 23/27 (85.2) 15/16 (93.8)
  >10,000 18/19 (94.7) 11/12 (91.7)
  >50,000 8/8 (100) -
Urine    
  <1,000 2/7 (28.6) 0/3 (0)
  >1,000 17/34 (50.0) 13/33 (39.4)
  >5,000 11/27 (37.0) 6/16 (37.5)
  >10,000 10/19 (52.6) 4/12 (33.3)
  >50,000 5/8 (62.5) -
  1. Note: Co-existence of both malaria species in three isolates was excluded from analysis.