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Population-controlled spread and intensity of diseases in wildlife

models that incorporate the spatial structure in some functional way, the other involving models that conceive the total population as simply composed of several interacting groups located at different sites. Specific applications are as yet few in number, but include the spread of measles, rabies and influenza. Finally, there is a brief discussion of the field of medical geography. This is concerned with variations in health and disease, particularly as related to environmental conditions, and is therefore of direct practical importance. Much of the quantitative work done so far is very descriptive and empirical in content. The subject would greatly benefit from more realistic applied developments in spatial epidemiological modelling.