Browsing by Author "GORDON, S."
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Item Epidemiology of Microbial Control of Insect Pest Populations(1971) GORDON, S.; Head Epidemiology Unit M.R.E Salisbury Wilshire U.KEnvironmental control of a pest species involves the manipulation of one or more components of the environment so as to reduce numbers. The use of organisms of a different kind, microbial pathogens, to induce epizootics is one example of this. The major organisms concerned include viruses,sporeforming and non-sporeforming bacteria, some protozoa and fungi. Three important parameters are considered, the host population, the pathogen population and transmission. Characteristics of the host population that limit the spread of a microbial disease include age and stage structure, innate resistance, population movements, behaviour, distribution and density and food preferences. Three important characteristics of the pathogen population are virulence and infectivity, survival and dispersal throughout the host habitat.Item Urbanization and the Epidemiology of Mosquito-Borne Disease(1971) GORDON, S.; Microbiology Research Establishment Portan salisburyMan is a major factor in the rapid environmental changes characteristic of the twentieth century. Deliberate changes in the environment may be made by man for a number of reasons: more food, hydroelectric power, more living continuing cycle of environmental modification. Associated with the growth of urban centres is industry, which, because it attracts large labour forces, increases the pressure for more living facilities and the demand for further agricultural extension, so contributing to a cycle of environmental change. If man is considered as a major ecological factor, urbanization is the major feature of the present-day dynamic environment.
