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01.12.2012 | Research | Ausgabe 1/2012 Open Access

Malaria Journal 1/2012

Laboratory markers of disease severity in Plasmodium knowlesi infection: a case control study

Zeitschrift:
Malaria Journal > Ausgabe 1/2012
Autoren:
Matthias Willmann, Atique Ahmed, Angela Siner, Ing Tien Wong, Lu Chan Woon, Balbir Singh, Sanjeev Krishna, Janet Cox-Singh
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​1475-2875-11-363) contains supplementary material, which is available to authorized users.

Competing interests

The authors declare that they have no competing interests.

Authors’ contribution

MW, AA, AS, ITW and LCW collected the blood samples and patients’ data. MW, AA and AS carried out the laboratory work. MW participated in the design of the study and analysed the data. JCS, BS and SK conceived the study and participated in its coordination. MW and JCS wrote the manuscript. All authors read, commented on and approved the final manuscript.

Abstract

Background

Plasmodium knowlesi malaria causes severe disease in up to 10% of cases in Malaysian Borneo and has a mortality rate of 1 - 2%. However, laboratory markers with the ability to identify patients at risk of developing complications have not yet been assessed as they have for other species of Plasmodium.

Methods

A case control study was undertaken in two hospitals in Sarikei and Sibu, Malaysian Borneo. One hundred and ten patients with uncomplicated (n = 93) and severe (n = 17) P. knowlesi malaria were studied. Standardized pigment-containing neutrophil (PCN) count, parasite density and platelet counts were determined and analysed by logistic regression and receiver operating characteristic (ROC) analysis.

Results

The PCN count was strongly associated with risk of disease severity. Patients with high parasite density (≥ 35,000/μl) or with thrombocytopaenia (≤ 45,000/μl) were also more likely to develop complications (odds ratio (OR) = 9.93 and OR = 5.27, respectively). The PCN count yielded the highest area under the ROC curve (AUC) estimate among all markers of severity (AUC = 0.8561, 95% confidence interval: 0.7328, 0.9794). However, the difference between all parameter AUC estimates was not statistically significant (Wald test, p = 0.73).

Conclusion

Counting PCN is labour-intensive and not superior in predicting severity over parasitaemia and platelet counts. Parasite and platelet counts are simpler tests with an acceptable degree of precision. Any adult patient diagnosed with P. knowlesi malaria and having a parasite count ≥35,000/μl or ≥1% or a platelet count ≤45,000/μl can be regarded at risk of developing complications and should be managed according to current WHO guidelines for the treatment of severe malaria.
Zusatzmaterial
Authors’ original file for figure 1
12936_2012_2564_MOESM1_ESM.tiff
Authors’ original file for figure 2
12936_2012_2564_MOESM2_ESM.tiff
Literatur
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