Differences in automated depolarization patterns of Plasmodium falciparum and P. vivax malaria infections defined by the Cell- Dyn (R) CD4000 haematology analyser


Fawzi, ZO; Fakhro, NA; Nabhan, RA; Alloueche, A; Scott, CS; (2003) Differences in automated depolarization patterns of Plasmodium falciparum and P. vivax malaria infections defined by the Cell- Dyn (R) CD4000 haematology analyser. Transactions of the Royal Society of Tropical Medicine and Hygiene, 97 (1). pp. 71-79. ISSN 0035-9203 DOI: https://doi.org/10.1016/S0035-9203(03)90029-0

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Abstract

Of 1014 samples submitted for full blood count analysis and malaria screening, 854 were designated malaria-negative by blood film microscopy, 79 were unequivocally identified as Plasmodium vivax and 81 as P. falciparum. All samples were additionally analysed with the Abbott Cell-Dyn(R) CD4000 haematology instrument, and leucocyte differential plots of 90degrees polarized vs. 90degrees depolarized (NEU-EOS plot) and 90degrees depolarized vs. 0degrees light (EOS I plot) scatter were specifically examined for abnormal depolarization patterns. Depolarization pattern types were correlated with microscopy (species) results, and these correlations were consolidated by polymerase chain reaction analysis. All 854 microscopically-designated malaria-negative samples showed a type 1 (normal) CD4000 depolarization pattern. Abnormal pattern types 2, 3a and 3b were entirely restricted to one of the two malaria categories. Plasmodium falciparum malaria showed two CD4000 pattern types only; a 'normal' type 1 pattern was seen in 36/75 (48%) cases and the remaining 39 cases were all abnormal pattern type 3a. In contrast, most (79/85) P. vivax malaria cases showed a distinctive clustered EOS I population (types 2 and 3b patterns) that was not seen with P. falciparum. Automated depolarization analysis provides an effective means of detecting malaria-associated haemozoin, and the patterns of intracellular haemozoin further appear to provide species differentiation between P. falciparum and P. vivax.

Item Type: Article
Keywords: malaria, Plasmodium falciparum, Plasmodium vivax, diagnosis, depolarization, haemozoin, Qatar, ribosomal-rna, pigment, sequence, diagnosis, hemozoin, genes, Animal, Eosinophils, metabolism, parasitology, Hemeproteins, metabolism, Human, Malaria, Falciparum, diagnosis, Malaria, Vivax, diagnosis, parasitology, Microscopy, Polarization, methods, Monocytes, metabolism, parasitology, Parasitology, methods, Plasmodium falciparum, isolation & purification, Plasmodium vivax, isolation & purification
Faculty and Department: Faculty of Infectious and Tropical Diseases > Dept of Immunology and Infection
PubMed ID: 12886809
Web of Science ID: 184231000020
URI: http://researchonline.lshtm.ac.uk/id/eprint/16125

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