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On the estimation of sequestered infected erythrocytes in Plasmodium falciparum malaria patients

Derdei Bichara 1, 2 Nathalie Cozic 1, 2 Abderrahman Iggidr 1, 2, *
* Corresponding author
1 MASAIE - Tools and models of nonlinear control theory for epidemiology and immunology
LMAM - Laboratoire de Mathématiques et Applications de Metz, Inria Nancy - Grand Est, IECL - Institut Élie Cartan de Lorraine
Abstract : The aim of this paper is to give a method for the estimation of total parasite burden of the patient and the rate of infection in a malaria's intra-host model by using control theory tools. More precisely, we use an auxiliary system, called {\it observer} or {\it estimator}, whose solutions tend exponentially to those of the original model. This observer uses only the available measurable data, namely, the values of peripheral infected erythrocytes. It provides estimates of the {\it sequestered infected erythrocytes,} that cannot be measured by clinical methods. Therefore this method allows to estimate the total parasite burden within a malaria patient. Moreover, our constructed observer does not use the uncertain infection rate parameter $\beta$. In fact, we derive a simple method to estimate this parameter $\beta$. We apply this estimation method using real data that have been collected when malaria was used as therapy for neurosyphilis by the US Public Health Service.
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Derdei Bichara, Nathalie Cozic, Abderrahman Iggidr. On the estimation of sequestered infected erythrocytes in Plasmodium falciparum malaria patients. Mathematical Biosciences and Engineering, AIMS Press, 2014, 11 (4), pp.741 - 759. ⟨10.3934/mbe.2014.11.741⟩. ⟨hal-00922456⟩

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