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Appears in Collections:Computing Science and Mathematics Journal Articles
Peer Review Status: Refereed
Title: Epifil: a dynamic model of infection and disease in lymphatic filariasis
Author(s): Chan, Man-Suen
Srividya, AdiNarayanan
Norman, Rachel
Pani, S P
Ramaiah, Kapa D
Vanamail, Perumal
Michael, Edwin
Das, Pradeep K
Bundy, Don A P
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Issue Date: Oct-1998
Date Deposited: 26-Sep-2012
Citation: Chan M, Srividya A, Norman R, Pani SP, Ramaiah KD, Vanamail P, Michael E, Das PK & Bundy DAP (1998) Epifil: a dynamic model of infection and disease in lymphatic filariasis. American Journal of Tropical Medicine and Hygiene, 59 (4), pp. 606-614.
Abstract: The lack of a quantitative framework that describes the dynamic relationships between infection and morbidity has constrained efforts aimed at the community-level control of lymphatic filariasis. In this paper, we describe the development and validation of EPIFIL, a dynamic model of filariasis infection intensity and chronic disease. Infection dynamics are modeled using the well established immigration-death formulation, incorporating the acquisition of immunity to infective larvae over time. The dynamics of disease (lymphodema and hydrocele) are modeled as a catalytic function of a variety of factors, including worm load and the impact of immunopathological responses. The model was parameterized using age-stratified data collected from a Bancroftian filariasis endemic area in Pondicherry in southern India. The fitted parameters suggest that a relatively simple model including only acquired immunity to infection and irreversible progression to disease can satisfactorily explain the observed infection and disease patterns. Disease progression is assumed to be a consequence of worm induced damage and to occur at a high rate for hydrocele and a low rate for lymphodema. This suggests that immunopathology involvement may not be a necessary component of observed age-disease profiles. These findings support a central role for worm burden in the initiation and progression of chronic filarial disease.
Rights: Publisher policy allows this work to be made available in this repository. Published in American Journal of Tropical Medicine and Hygiene October 1998 vol. 59 no. 4, pp. 606-614 by [publisher]. The original publication is available at

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