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The nodule-forming process of Onchocerca volvulus
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By a stochastic process we have described how female O. volvulus
aggregate into onchocercomata.
This model can be used for estimating the probability with which
a female larvae (L4) forms a new nodule or immigrates into an already existing one.
An estimation performed on
nodulectomy data
shows that a female L4
rather immigrates into an existing nodule than forms a new one.
A biological explanation for this phenomenon is not yet known and poses
the question if the female parasite attains advantage of this aggregation behaviour.
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Figure: Number of nodules (y-axis) which have been formed by female
O. volvulus isolated from the nodules subsequent to surgery (nodulectomy).
The solid line results from the probability (40%) that a developing larva 4 (L4)
forms a new nodule (instead of immigrating into an existing one
at a probability 60%).
The dashed lines represent the region of tolerance
spanning 95% of the observations.
(Source: Duerr et al., 2001)
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 Retour au début de la page
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Responsable de cette page:
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Dr. H.-P. Duerr
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Webmaster:
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Prof. Dr. M. Eichner
(dernière modification de cette page:
13 juli 2009)
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Collaborateur:
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Prof. K. Dietz, Institut für Medizinische Biometrie (IMB), Tübingen
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Prof. M. Eichner
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Autres partenaires pour ce projet:
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Prof. H. Schulz-Key |
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Soutenu financièrement par:
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Deutsche Forschungsgemeinschaft (DFG, DI 308/12-1)
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Traduit en français par:
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Claire Le Roux,
Université de Valenciennes et du Hainaut Cambraisis (UVHC),
Institut des Sciences et Techniques (ISTV), France
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Avertissement:
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L'Université Eberhard Karl de Tübingen,
le Centre Hospitalier Universitaire de Tübingen,
le Département de Biométrie Médicale (IMB),
ainsi que les auteurs de cette page déclinent toute responsabilité pour le contenu des pages auxquelles cette page renvoie
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