Thesis (Ph. D. (Social Work)) --University of Limpopo, 2018 / Despite the laudable progress on HIV and AIDS interventions encountered in South Africa, new HIV infection remains a challenge. Limpopo Department of Agriculture is not an exception as far as new HIV infections are concerned, regardless of the intervention efforts made. This study aimed at exploring on perceptions of LDA employees on social-behavioural and structural core drivers of HIV infection. Qualitative research methodologies were applied. A purposive sample of twenty participants (10 men and 10 women) was selected from Department of Agriculture, Mopani District, Limpopo Province. Constructivism and structuralism theoretical framework were used to navigate the study. Semi-structured, face-to-face interviews were designed. Data was collected through interviews, audio-recorded and transcribed. Eight steps of data analysis were followed as proposed by Creswell. Guidelines for the prevention of new HIV infection were developed. Some of the major findings are that: the socio-behavioural core drivers that place all partners at risk of contracting new HIV infections is the Multiple Sexual Partnerships (MSPs). Age-disparate relationships in a workplace were also socio-behavioural drivers of new HIV infection. Young women and men who enter into age-disparate relationships have intention of obtaining permanent employment. Patriarchy was found to be amongst the structural core drivers of new HIV infections. The fact that men are not tested involuntarily is viewed as a structural barrier towards eliminating the spread of new HIV infections. Stigma has been also found to be a core driver of new HIV infections. Some conclusions made are: MSPs is a closed sexual network system, characterised by “secrecy” and “trust”. Despite some reforms purporting to improve women’s status, patriarchal domination is still at its toll. Unsymbolised stigma remains a threat towards elimination of the spread of HIV infections. The major recommendations are that working women still require empowerment in number of areas of their social functioning, and the leadership involvement in the fight against the spread of new HIV infections.

This dissertation assesses the factors that lead to the emergence of infectious diseases in children, particularly the emergence of multidrug-resistant organisms (MDROs) and diarrheal pathogens in vulnerable pediatric populations. It includes three manuscripts. The initial study is a systematic review that summarized the role of antibiotic exposure on the acquisition of MDROs in children. Twenty-nine studies met the inclusion criteria and a positive association between prior antibiotic use and subsequent colonization or infection with an MDRO was identified in most studies. There were wide variations among study sites, populations, and definitions of antibiotic use and MDROs. Therefore, limited inferences could be made on which components of antibiotic exposure have the greatest impact on MDRO development. The second analysis examines the relationship between prior stay at a pediatric long-term care (LTC) facility and infection with an MDRO among hospitalized children. This study included 2,945 infections in 258,664 pediatric admissions from 2006 through 2016. At least 1 MDRO was identified in 10% of infections. Of the 1,198 children who had previously resided in a pediatric LTC facility, only 1 child (0.08%) had an MDRO infection. However, prior receipt of pediatric LTC was associated with an increased likelihood of infection (OR 2.4, CI95 1.66 – 3.43), C. difficile infection (OR 2.57, CI95 1.26 – 5.25), days of antibiotic use (OR 1.01, CI95 1.01 – 1.02), length of stay (OR 1.01, CI95 1.01 – 1.01), and death (OR 4.38, CI95 2.93 – 6.55). The concluding study evaluates the association between animals living in or near the home and diarrheal disease in children. This research is a secondary analysis of the Global Enteric Multicenter Study case control study, which investigated the epidemiology of diarrheal illness in children <5 in sub-Saharan Africa and south Asia. Of 9,439 cases and 13,128 controls, 87% had ≥1 animal in their home. In a multivariable analysis adjusting for exclusive breastfeeding, water source, sanitation facility, number of children <5 years in the household, and wealth index, any animal on a child’s compound decreased the odds of diarrhea by 33% (aOR 0.66, CI95 0.59 – 0.74). However, children with diarrhea who had an animal present were not more likely to have a positive stool culture. Overall, the three studies provide a thorough analysis of several factors associated with the infectious disease emergence in children, particularly as related to MDROs and diarrheal disease. Environmental characteristics, including antibiotic use and interaction with animals, were shown to be important factors for emergent infectious disease across diverse settings. The development of pediatric infection prevention interventions should take into consideration environmental risk factors in order to effectively mitigate the risks posed infectious disease emergence.

Due to the recent increased quantity of nutrition-related diseases worldwide, current research recommends exploring environmental factors that influence this trend. The Islands of Fiji are of particular concern because of the growing number of non- communicable diseases. On the same small island, nutrition problems vary according to demographic. Thus, the different environments of each demographic constitute diverse food environments, which are manifested in varied nutrition concerns. This study explored environmental motivators of food choice for the Fijian population. Gathering the perspectives of Fijian Islanders using a narrative inquiry research format proved to be insightful in measuring the environmental influences of decisions pertaining to food.

<p>Hypertension is one of the most common non-communicable diseases, and it is the leading cause of cardiovascular diseases, death and disability worldwide, especially in developing countries. Physical activity has been regarded as a commonly accepted modality for preventing and treating hypertension. However, despite its known benefits, this modality of treatment and prevention of&nbsp / hypertension continues to be underused. The present study aimed to determine the demographic, social and health-related factors that are associated with levels of physical activity participation among adults with hypertension in Kigali, Rwanda. This cross-sectional study was conducted with 252 adults with hypertension and 87 healthcare professionals through the Godin Leisure-Time&nbsp / Exercise Questionnaire (GLTEQ) and Physical Activity Exit Interview (PAEI). Two thirds of the participants (69.44%) were classified as sedentary. The following factors were found to be significantly&nbsp / (P&lt / 0.05) associated with the levels of physical activity: age, marital status, and level of education, residence, tobacco / past and current users, alcohol / current user, diabetes mellitus, BMI, perceived health status, self-efficacy, and blood pressure. None of the healthcare professionals were considered good physical activity counsellor. The findings of the present study highlight the need for the implementation of health promotion strategies aimed at promoting physical activity lifestyle among individuals with hypertension in Rwanda. Efforts should be made in educating people with hypertension on the benefits of integrating regular physical&nbsp / activity in their daily lives. Furthermore, healthcare professionals should be educated concerning how to promote physical&nbsp / activity to all patients especially those with hypertension.</p>

The aim of this study was to analyse how physical activity in the prevention and treatment of diseases, is portrayed in Vietnamese media. This is interesting because the traditional Vietnamese health culture differs a lot from the Western one. The topic is also of immediate importance in Vietnam, because of the increasing numbers of diseases, such as diabetes and cardiovascular diseases, even called non-communicable diseases. This is connected to the decreasing physical activity and increasing obesity in the country. A Swedish-Vietnamese project in Vietnam is going on since two years, with the aim of disseminating Swedish experiences on the topic to the health care staff and the general public. Thirty-one articles have been analysed with regard to cultural references and persuasion means. The methods include rhetorical analysis, quantitative content analysis and semiotics. The theoretical framework constitutes of previous research on characteristics of Vietnamese/Asian journalism in general, and Vietnamese preventive health education in particular. To get a better understanding of the results, various theories such as post-colonialism and cultural hegemony have been used. The findings indicate that the articles portray the health-benefits of physical activity as something new to the Vietnamese people. It was not possible to find any point of similarity to the traditional forms of Vietnamese preventive health propaganda in the articles. The different references in the articles where mostly made to Western sources. The pictures in the articles signal both threat/fear and hope and they portray both people with East Asian-and Western appearance.

For the last several decades, sequential change point problems have been studied in both the theoretical area (sequential analysis) and the application area (industrial SPC). In the conventional application, the baseline process is assumed to be stationary, and the shift pattern is a step function that is sustained after the shift. However, in biosurveillance, the underlying assumptions of problems are more complicated. This thesis investigates several issues in biosurveillance such as non-homogeneous populations, spatiotemporal surveillance methods, and correlated structures in regional data. The first part of the thesis discusses popular surveillance methods in sequential change point problems and off-line problems based on count data. For sequential change point problems, the CUSUM and the EWMA have been used in healthcare and public health surveillance to detect increases in the rates of diseases or symptoms. On the other hand, for off-line problems, scan statistics are widely used. In this chapter, we link the method for off-line problems to those for sequential change point problems. We investigate three methods--the CUSUM, the EWMA, and scan statistics--and compare them by conditional expected delay (CED). The second part of the thesis pertains to the on-line monitoring problem of detecting a change in the mean of Poisson count data with a non-homogeneous population size. The most common detection schemes are based on generalized likelihood ratio statistics, known as an optimal method under Lodern's criteria. We propose alternative detection schemes based on the weighted likelihood ratios and the adaptive threshold method, which perform better than generalized likelihood ratio statistics in an increasing population. The properties of these three detection schemes are investigated by both a theoretical approach and numerical simulation. The third part of the thesis investigates spatiotemporal surveillance based on likelihood ratios. This chapter proposes a general framework for spatiotemporal surveillance based on likelihood ratio statistics over time windows. We show that the CUSUM and other popular likelihood ratio statistics are the special cases under such a general framework. We compare the efficiency of these surveillance methods in spatiotemporal cases for detecting clusters of incidence using both Monte Carlo simulations and a real example. The fourth part proposes multivariate surveillance methods based on likelihood ratio tests in the presence of spatial correlations. By taking advantage of spatial correlations, the proposed methods can perform better than existing surveillance methods by providing the faster and more accurate detection. We illustrate the application of these methods with a breast cancer case in New Hampshire when observations are spatially correlated.

Master's thesis. / Format: PDF. Bibl.

Thesis (Ph. D.)--University of North Texas, Aug., 2009. / Title from title page display. Includes bibliographical references.

Thesis (M.A.)--University of Canterbury, 2009. / Typescript (photocopy). Includes bibliographical references (leaves 146-158). Also available via the World Wide Web.

published_or_final_version / Geography / Doctoral / Doctor of Philosophy