Invited review
Multiparasite communities in animals and humans: frequency, structure and pathogenic significance

Dedicated to Professor Erhard Hinz on his retirement as Director of the Department of Parasitology, Hygiene Institute, University of Heidelberg, Germany.
https://doi.org/10.1016/S0020-7519(97)00189-6Get rights and content

Abstract

Individual humans and animals are subject to infection by a variety of parasites (broadly defined to include viruses, bacteria and other non-protozoan microparasites) at any one time. Multiple parasite infections occur frequently in populations of wild animals as well as in humans from developing countries. In some species and regions, hosts with multiple infections are more common than hosts with either no infection or a single infection. Studies, predominantly on animals, show that a wide variety of environmental and host-dependent factors can influence the structure and dynamics of the communities of parasites that make up these multiple infections. In addition, synergistic and competitive interactions can occur between parasite species, which can influence the likelihood of their successful transmission to other hosts and increase or decrease their overall pathogenic impact. This review summarises aspects of our current knowledge on the frequency of multiparasite infections, the factors which influence them, and their pathogenic significance.

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