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Hookworm control program submitted ... in partial fulfillment ... Master of Science in Public Health /Sanchez Basseres, Mauricio José. January 1942 (has links)
Thesis (M.S.P.H.)--University of Michigan, 1942.
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The administrative and clinical management of hookworm disease in the Rio Doce Valley, Brazil a major term report submitted in partial fulfillment ... Master of Public Health ... /Pantoja, Woodrow P. January 1947 (has links)
Thesis equivalent (M.P.H.)--University of Michigan, 1947.
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A hookworm control program a thesis submitted in partial fulfillment ... Master of Public Health ... /Rosario, Nelson Augusto. January 1945 (has links)
Thesis (M.P.H.)--University of Michigan, 1945.
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A hookworm control program a thesis submitted in partial fulfillment ... Master of Public Health ... /Rosario, Nelson Augusto. January 1945 (has links)
Thesis (M.P.H.)--University of Michigan, 1945.
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The administrative and clinical management of hookworm disease in the Rio Doce Valley, Brazil a major term report submitted in partial fulfillment ... Master of Public Health ... /Pantoja, Woodrow P. January 1947 (has links)
Thesis equivalent (M.P.H.)--University of Michigan, 1947.
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Hookworm control program submitted ... in partial fulfillment ... Master of Science in Public Health /Sanchez Basseres, Mauricio José. January 1942 (has links)
Thesis (M.S.P.H.)--University of Michigan, 1942.
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Environmental factors influencing the distribution hookworm infection in KwaZulu-Natal, South Africa [sic].Mabaso, Musawenkosi. January 1998 (has links)
The aim of this study was to investigate the occurrence of the soil transmitted parasitic
nematode Necator americanus ("Old World" hookworm) in soils of different texture in
KwaZulu-Natal. The key questions being asked were: (i) Is hookworm infection in
KwaZulu-Natal confined to the coastal plain? (ii) Is there any association between
hookworm prevalence and the different soil types in the province? (iii) Since several
examples exist in the province of soil types on which hookworm is transmitted on the
coastal plain, occurring inland, what is the status of infection in communities situated in
these areas? (iv) What properties of soil are important in the transmission ecology of
hookworm larvae?
All available hookworm prevalence data of KwaZulu-Natal were mapped on Land Type
maps of the province (Land Type Survey Staff, 1986). Several additional surveys were
carried out to supplement this database. Faecal egg counts were obtained by the Formal-Ether
Concentration Method and positive infections were confirmed as N. americanus by
larval morphology after coproculture using the Harada-Mori Technique. Univariate
analysis was carried out for significant associations between hookworm prevalence,
altitude, climatic variables (rainfall and temperature) and soil type. The results showed
that areas ≤ 150m above sea level (i.e. the coastal plain) support high prevalences (x ‾ = 45
%), and are characterised by low-clay textured soils, warm temperatures and relatively
high rainfall. Areas > 150 m (i.e. inland) have low hookworm prevalences (x ‾ = 6 %), and
are characterised by high-clay textured soils, cool temperatures and moderate rainfall.
Hookworm prevalence also decreased southwards as climatic conditions (rainfall and
temperature) become unfavourable, and the coastal plain also narrows in this direction.
Multivariate analysis was done to determine which environmental factors combine best to
provide favourable conditions for hookworm transmission. From the variables used,
prevalence of infection was most significantly correlated with the mean daily minimum
temperature for January followed by the mean number of rainy days for January. This
points to the importance of summer conditions in the transmission of hookworm infection
in KwaZulu-Natal.
Moderate hookworm prevalences (x ‾ = 17.3 %) were found in the inland sandy areas,
dropping to low prevalences (x ‾ = 5.3 %) in the surrounding non-sandy areas. The
intensity-related data could not be significantly correlated with the environmental variables
used in this study. The Spearman Correlation Coefficient was used to test for
relationships between hookworm prevalence and soil variables. In the results, only the
fine and medium sand fractions showed positive correlations with hookworm prevalence.
Clay showed a significant negative correlation with hookworm prevalence. No significant
correlations were found between soil pH or its organic matter content and hookworm
prevalence. Age and sex related infection data could not be drawn into the analysis due to
the small sample size of study localities. / Thesis (M.Sc.)-University of Natal, Durban, 1998.
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Multi-scale modelling of soil-transmitted Helminths infections in humansMakhuvha, Mulalo 18 May 2019 (has links)
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
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