No description available.

The seasonal fluctuations in the worm burdens of pigs, sheep, cattle, impala and blesbok exposed to infestation on improved or natural pastures in the Transvaal were determined. The prevalence of infestation in pigs slaughtered at the Pretoria Municipal Abattoir and in impala near Pafuri and blesbok at Badplaas was also established. Sheep, goats and cattle were successfully artificially infested with a number of nematodes of impala origin and sheep with those of blesbok origin. The various methods used to determine the seasonal incidence of helminth parasites are discussed and the wastage of valuable material criticised when complete recoveries of both internal and external parasites are not attempted at each necropsy. Host specificity and the distribution of parasites according to climate and the zoogeographical distribution of their hosts are discussed and the epizootiology of the major nematode genera parasitizing sheep, cattle, impala and blesbok in the Transvaal is determined. The phenomenon of arrested development in nematodes is compared with that of diapause in insects and measures to control helminth parasites 1n domestic stock and antelope in the Transvaal are suggested. / Thesis (Ph.D.)-University of Natal, Pietermaritzburg, 1980.

Thesis (Ph. D.)--University of Texas at El Paso, 2007. / Title from title screen. Vita. CD-ROM. Includes bibliographical references. Also available online.

Thesis (D.Sc.1974) from the Dept. of Entomology, University of Adelaide.

Thesis (Ph.D.)--Murdoch University, 2003. / Thesis submitted to the Division of Health Sciences. Bibliography: p. 195-239.

Thesis (M.Sc. Tropical Medicine))--Mahidol University, 1979.

Thesis (M.Ph.)--Georgia State University, 2007. / Title from title page. Karen E. Gieseker, committee chair; Russ Toal, Patrick J. Lammie, committee members. Electronic text (135 p. : ill.) : digital, PDF file. Description based on contents viewed October 10, 2007. Includes bibliographical references (p. 115-135).

No description available.

No description available.

MSc (Applied Mathematics) / Department of Mathematics and Applied Mathematics / In this study, we develop a multiscale model of soil transmitted helminths in humans with a special reference to hookworm infection. Firstly, we develop a single scale model that comprises of five between host scale populations namely; susceptible humans, infected humans, eggs in the physical environment, noninfective worms in the physical environment and infective worms in the physical environment. Secondly, we extend the single scale model to incorporate within-host scales namely; infective larvae within-host, immature worms in small intestine, mature worm population and within-host egg population which resulted to a multiscale model. The models are analysed both numerically and analytically. The models are epidemiologically and mathematically well posed. Numerical simulation results show that there is a bidirectional relationship between the between-host and within-host scales. This is in agreement with the sensitivity analysis results, we noted that the same parameters that reduce reproductive number R0 are the same parameters that reduce the infective worms endemic equilibrium point. From the comparative effectiveness of hookworm interventions analysis results, we notice that any intervention combination that include wearing shoes controls and reduces the spread of the infection. The modelling framework developed in this study is vigorous to be applicable to other soil transmitted helminths infections / NRF