Skip to main content
×
Home
    • Aa
    • Aa

A stochastic model for the aggregation of Onchocerca volvulus in nodules

  • H. P. DUERR (a1) (a2), K. DIETZ (a1), D. W. BÜTTNER (a3) and H. SCHULZ-KEY (a2)
Abstract

A model is presented which describes the aggregation of female Onchocerca volvulus in nodules and their distribution in the human population. The basic model is based on a single parameter, the formation probability q, which represents the probability with which incoming larvae form a new nodule. This parameter describes parasite behaviour which cannot easily be recognized in available data without modelling. The estimate for the average formation probability of μq = 0.39 suggests an attraction of the invading infective larvae to already existing nodules or resident worms with probability 0.61. No significant difference in μq was found between the forest and savanna parasite strains. The model can be used inversely to estimate the worm burden of persons from palpation data. The observed variance in the number of nodules per person requires the assumption of a variance-increasing mechanism which was implemented by heterogeneity within the host population (extended model with 2 parameters). Possible reasons for this heterogeneity are presented and its implications concerning the reproductive biology of the parasite are discussed.

Copyright
Corresponding author
Corresponding author: Department of Medical Biometry, University of Tübingen, Westbahnhofstrasse 55, 72070 Tübingen, Germany. Tel: +49 7071 2978259. Fax: +49 7071 295075. E-mail: hans-peter.duerr@uni-tuebingen.de
Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

DUERR, H. P. & DIETZ, K. (2000). Stochastic models for aggregation processes. Mathematical Biosciences165, 135145.

PLENGE-BÖNIG, A., KRÖMER, M. & BÜTTNER, D. W. (1995). Light and electron microscopy studies on Onchocerca jakutensis and O. flexuosa of red deer show different host–parasite interactions. Parasitology Research81, 6673.

SCHULZ-KEY, H. & KARAM, M. (1986). Periodic reproduction of Onchocerca volvulus. Parasitology Today2, 284286.

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Parasitology
  • ISSN: 0031-1820
  • EISSN: 1469-8161
  • URL: /core/journals/parasitology
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Keywords:

Metrics

Full text views

Total number of HTML views: 2
Total number of PDF views: 6 *
Loading metrics...

Abstract views

Total abstract views: 31 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 30th May 2017. This data will be updated every 24 hours.