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01.12.2012 | Research | Ausgabe 1/2012 Open Access

Malaria Journal 1/2012

Evaluation of the OnSite (Pf/Pan) rapid diagnostic test for diagnosis of clinical malaria

Malaria Journal > Ausgabe 1/2012
Abu Naser Mohon, Rubayet Elahi, Milka Patracia Podder, Khaja Mohiuddin, Mohammad Sharif Hossain, Wasif A Khan, Rashidul Haque, Mohammad Shafiul Alam
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​1475-2875-11-415) contains supplementary material, which is available to authorized users.

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

ANM and MSA conceptualized and designed the study, collected and identified samples, analysed the data, drafted the manuscript and made final revisions. ANM, RE. MPP, KM, WAK, RH and MSA did sample analyses and made critical revision of the manuscript. MSH conducted data analysis. ANM, RE and MSA drafted the manuscript. All the authors read the final version of the manuscript and approved.



Accurate diagnosis of malaria is an essential prerequisite for proper treatment and drug resistance monitoring. Microscopy is considered the gold standard for malaria diagnosis but has limitations. ELISA, PCR, and Real Time PCR are also used to diagnose malaria in reference laboratories, although their application at the field level is currently not feasible. Rapid diagnostic tests (RDTs) however, have been brought into field operation and widely adopted in recent days. This study evaluates OnSite (Pf/Pan) antigen test, a new RDT introduced by CTK Biotech Inc, USA for malaria diagnosis in a reference setting.


Blood samples were collected from febrile patients referred for malaria diagnosis by clinicians. Subjects were included in this study from two different Upazila Health Complexes (UHCs) situated in two malaria endemic districts of Bangladesh. Microscopy and nested PCR were considered the gold standard in this study. OnSite (Pf/Pan) RDT was performed on preserved whole blood samples.


In total, 372 febrile subjects were included in this study. Of these subjects, 229 (61.6%) tested positive for Plasmodium infection detected by microscopy and nested PCR. OnSite (Pf/Pan) RDT was 94.2% sensitive (95% CI, 89.3-97.3) and 99.5% specific (95% CI, 97.4-00.0) for Plasmodium falciparum diagnosis and 97.3% sensitive (95% CI, 90.5-99.7) and 98.7% specific (95% CI, 96.6-99.6) for Plasmodium vivax diagnosis. Sensitivity varied with differential parasite count for both P. falciparum and P. vivax. The highest sensitivity was observed in febrile patients with parasitaemia that ranged from 501–1,000 parasites/μL regardless of the Plasmodium species.


The new OnSite (Pf/Pan) RDT is both sensitive and specific for symptomatic malaria diagnosis in standard laboratory conditions.
Authors’ original file for figure 1
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