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Population biology of multispecies helminth infection: interspecific interactions and parasite distribution

Bottomley, C; Isham, V; Basanez, MG; (2005) Population biology of multispecies helminth infection: interspecific interactions and parasite distribution. PARASITOLOGY , 131 417 - 433. 10.1017/S0031182005007791. Green open access

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Abstract

Despite evidence for the existence of interspecific interactions between helminth species, there has been no theoretical exploration of their effect on the distribution of the parasite species in a host population. We use a deterministic model for the accumulation and loss of adult worms of 2 interacting helminth species to motivate an individual-based stochastic model. The mean worm burden and variance: mean ratio (VMR) of each species, and the correlation between the two species are used to describe the distribution within different host age classes. We find that interspecific interactions can produce convex age-intensity profiles and will impact the level of aggregation (as measured by the VMR). In the absence of correlated exposure, the correlation in older age classes may be close to zero when either intra- or interspecific synergistic effects are strong. We therefore suggest examining the correlation between species in young hosts as a possible means of identifying interspecific interaction. The presence of correlation between the rates of exposure makes the interpretation of correlations between species more difficult. Finally we show that in the absence of interaction, strong positive correlations are generated by averaging across most age classes.

Type: Article
Title: Population biology of multispecies helminth infection: interspecific interactions and parasite distribution
Open access status: An open access version is available from UCL Discovery
DOI: 10.1017/S0031182005007791
Keywords: helminths, interspecific interactions, stochastic model, correlation, overdispersion, INTESTINAL HELMINTHS, SCHISTOSOMA-HAEMATOBIUM, GEOGRAPHICAL VARIATION, ONCHOCERCA-VOLVULUS, CROSS-PROTECTION, BROWN TROUT, HOST, COMMUNITIES, MALARIA, ASSOCIATIONS
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Statistical Science
URI: https://discovery.ucl.ac.uk/id/eprint/536
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