Evaluation of the OptiMAL test for diagnosis of malaria in Venezuela.
We evaluated the OptiMAL rapid dipstick test by comparing it with the conventional standard thick-blood film method, for the detection of malaria in two groups of individuals from different Venezuelan endemic areas. One of the groups consisted of individuals with malaria-like symptoms (n = 113) and the other of asymptomatic individuals (n = 89). The classical microscopy analysis of these populations determined that 67.5% were infected with P. vivax, 31.3% with P. falciparum, and 1.2% with mixed infections. The OptiMAL test showed 96.4% sensitivity, 100% specificity, 100% positive predictive value, 97.5% negative predictive value and optimal concordance (kappa = 0.97), capable of detecting any malaria infection in the evaluated population. However, these parameters were lower when the parasitaemia was < or = 300 parasites/microL. Freezing of the samples did not affect the sensitivity and specificity of the test. We concluded that this rapid malaria test is sensitive and specific for rapid diagnosis of malaria in the field and it is a complement to conventional microscopy.
Zerpa
Noraida
N
Fundación Instituto de Estudios Avanzados (IDEA), Centro de Biociencias, Sartenejas, Caracas, Venezuela. norazerpa@yahoo.com
Pabón
Rosalba
R
Wide
Albina
A
Gavidia
Magda
M
Medina
Mehudi
M
Cáceres
José Luis
JL
Capaldo
Jacinta
J
Baker
Meghan
M
Noya
Oscar
O
D006403:Hematologic Tests; D006801:Humans; D008288:Malaria / Q000175:diagnosis* / Q000469:parasitology*; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity