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Malaria Journal
Published in: Malaria Journal 1/2015

Open Access 01-12-2015 | Research

Molecular characterization of misidentified Plasmodium ovale imported cases in Singapore

Authors: Jean-Marc Chavatte, Sarah Bee Hui Tan, Georges Snounou, Raymond Tzer Pin Valentine Lin

Published in: Malaria Journal | Issue 1/2015

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Abstract

Background

Plasmodium ovale, considered the rarest of the malaria parasites of humans, consists of two morphologically identical but genetically distinct sympatric species, Plasmodium ovale curtisi and Plasmodium ovale wallikeri. These parasites resemble morphologically to Plasmodium vivax with which they also share a tertian periodicity and the ability to cause relapses, making them easily misidentified as P. vivax. Plasmodium ovale infections are rarely reported, but given the likelihood of misidentification, their prevalence might be underestimated.

Methods

Morphological and molecular analysis of confirmed malaria cases admitted in Singapore in 2012–2014 detected nine imported P. ovale cases that had been misidentified as P. vivax. Since P. ovale had not been previously officially reported in Singapore, a retrospective analysis of available, frozen, archival blood samples was performed and returned two additional misidentified P. ovale cases in 2003 and 2006. These eleven P. ovale samples were characterized with respect to seven molecular markers (ssrRNA, Potra, Porbp2, Pog3p, dhfr-ts, cytb, cox1) used in recent studies to distinguish between the two sympatric species, and to a further three genes (tufa, clpC and asl).

Results

The morphological features of P. ovale and the differential diagnosis with P. vivax were reviewed and illustrated by microphotographs. The genetic dimorphism between P. ovale curtisi and P. ovale wallikeri was assessed by ten molecular markers distributed across the three genomes of the parasite (Genbank KP050361-KP050470). The data obtained for seven of these markers were compared with those published and confirmed that both P. ovale species were present. This dimorphism was also confirmed for the first time on: (1) two genes from the apicoplast genome (tufA and clpC genes); and, (2) the asl gene that was used for phylogenetic analyses of other Plasmodium species, and that was found to harbour the highest number of dimorphic loci between the two P. ovale species.

Conclusion

Misidentified P. ovale infections are reported for the first time among imported malaria cases in Singapore. Genetic dimorphism between P. ovale curtisi and P. ovale wallikeri was confirmed using markers from the parasites’ three genomes. The apparent increase of imported P. ovale since 2012 (with yearly detection of cases) is puzzling. Given decrease in the overall number of malaria cases recorded in Singapore since 2010 the ‘resurgence’ of this neglected species raises public health concerns.
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Metadata
Title
Molecular characterization of misidentified Plasmodium ovale imported cases in Singapore
Authors
Jean-Marc Chavatte
Sarah Bee Hui Tan
Georges Snounou
Raymond Tzer Pin Valentine Lin
Publication date
01-12-2015
Publisher
BioMed Central
Published in
Malaria Journal / Issue 1/2015
Electronic ISSN: 1475-2875
DOI
https://doi.org/10.1186/s12936-015-0985-8

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