Thesis (MTech (Environmental Health))--Peninsula Technikon, Cape Town, 2003 / Recent studies have reported an increased prevalence (19%) of respiratory symptoms among furm workers exposed to pesticides. International studies suggest excessive pesticide use and biological factors such as outdoor mites as important factors responsible for asthma symptoms. Studies in Korea suggest that spider mites may be responsible for allergic asthma symptoms among workers on fruit (citrus, apple, and . pear) furms. The fuming of wine and table grapes in South Africa involves about 3000 farms employing over 50,000 workers. Workers on table grape farms, in contrast to other fruit farms have not been previously investigated for occupational respiratory allergy to spider mites. Objectives • To determine the spectrum and prevalence of work-related allergy and asthma among table grape farm workers • To determine the environmental and host factors associated with work-related symptoms and allergic outcomes. Methods: A cross-sectional study was conducted on 207 workers employed on nine table grape farms in the Hex River valley of South Africa. A modified European Community Respiratory Health Survey questionnaire was used to interview workers. Skin prick tests used 8 commercial extracts of common airborne allergens (ALK) and potential occupational allergens, which included grape mould (Botrytis cinerea) and an in-house extract of spider mite, Tetranychus urticae. Specific IgE to Tetranychus urticae was determined using enzyme-linked immunosorbent assay (ELISA) and to house dust mite (Dermatophagoides Pteronyssinus) and storage mite (Lepidoglyphus Destructor) using Pharrnacia CAPRAST. Results: The mean age of the workers was 36 years with a standard deviation of 11 years.

Unknown questions remain concerning the health of migrant farm workers, seasonal farm workers, and other rural poor people. The objectives of this study were to determine the demographic profile of a sample from a Community and Migrant Health Center; to determine the prevalence of disease in migrant farm workers, seasonal farm workers and other clients; and to determine if differences existed in the prevalence of disease between the three occupational groups. Information from medical records for clients who visited an Oregon Community and Migrant Health Center during 1993 was abstracted to determine whether differences existed in demographic characteristics and in health status between migrant farm workers, seasonal farm workers, and other clients. A random sample of 600 medical charts was selected from the three occupational groups stratified by sex. The sample included adults and children classified as migrant or seasonal farm workers and other clients. Data abstracted from charts included socio-demographic information, physiologic measurements, biochemical testing results, and disease prevalence. Clients in this sample represented Latino (85.17%), Russian (4.8%), and Anglo (10%) cultures. Female clients who were not migrant or seasonal farm workers had a mean age of 27.42 years which was significantly different from the mean age of female migrant farm workers of 18.95 years, and of female seasonal farm workers of 20.35 years. Females who were not migrant or seasonal farm workers had significantly higher mean body mass indexes, and systolic and diastolic blood pressures. Female children classified as migrant farm worker had significantly higher blood lead levels than female children whose parents were not migrant or seasonal farm workers. Glucose levels for migrant farm workers was significantly higher than either of the other two occupational groups. Findings of the study indicated that common diagnoses included upper respiratory infection, otitis media, intestinal parasites or pathogens, dermatitis, and urinary tract infection. The most commonly reported injuries were due to lacerations and motor vehicle accidents. Additionally, 31.57% of PAP tests were abnormal, and violence against girls and women was reported. Diagnoses of chronic diseases included diabetes, hypertension, AIDS, cancer, and heart disease. / Graduation date: 1996

The purpose of this study was to describe, explicate, and systematically analyze the culture care values, beliefs, and practices of migrant farm workers related to health promoting behaviors in context of their temporary living accommodations and work setting in two small towns in east central Indiana. The goal of this study was to generate knowledge regarding culture care values, beliefs, and practices of migrant farm workers related to health promoting behaviors. Such knowledge can be used by nurses to provide culturally congruent care which can influence migrant farm workers' health and well-being.The theoretical framework for the study was Leininger's Theory of Culture Care Diversity and Universality. The qualitative ethnonursing research method was used. Semi-structured interviews were conducted using both an ethnonursing inquiry guide and an ethno-demographic information guide developed by the researcher.Sixteen key informants and three general informants participated in the study. Informants were purposefully selected for knowledge of migrant farm life and willingness to share this knowledge with the researcher. Key informants were Mexican American migrant farm workers in east central Indiana for farm and tomato factory work from July through October, 2004. General informants were health and social service workers who provided care for the migrant farm workers. Three key informants were interviewed twice each. All other informants were interviewed once. Interviews took place in the informants' homes and at a local food pantry. Interviews were audio taped and transcribed verbatim.Four major themes were synthesized from the research data: (a) health promoting behaviors are recognized and valued by migrant farm workers but are influenced by economic and political/legal factors in the social structure; (b) traditional gender roles of migrant farm worker men and women influence health promoting behaviors; (c) professional caring is viewed by migrant farm workers as respect through the use of the Spanish language and acceptance of culture care values, beliefs, and practices; and (d) health promoting behavior of migrant farm workers is influenced both by traditional culture care values and beliefs and by knowledge acquired through diverse formal and informal education. Findings were discussed in relation to Leininger's three modes of culture care action for nurses: culture care preservation/maintenance, accommodation/negotiation, and repatterning/restructuring. / Department of Educational Studies

Thesis (Masters Diploma (Technology)--Cape Technikon, Cape Town,1994 / Pesticides are generally used in south-Africa for the control of various pests; from insects and fungi to weeds. The agricultural industry is probably the biggest user of pesticides and therefore workers in this part of the labour force have the biggest risk of being exposed to the hazards of these essential products. During the 1988/89 deciduous fruit season the deciduous fruit industry earned approximately R1000 million in foreign exchange. It is therefore very important for this industry to produce fruit of high quality in a very competitive market. Of the total deciduous exports, apples comprised approximately 62,5%. The EIgin-Grabouw area is the biggest producer of apples. This industry is clearly very dependant on pesticides to protect its crops against pests. From time to time farm - workers are exposed to pesticides, a study was therefore performed to access the levels of exposure of farm workers. Blood and urine samples were collected in a comprehensive biological monitoring program in the Elgin area to determine, uusing clinical tests, the level of exposure to pesticides. It was decided later that the determination of pesticide residues in blood would form part of this main study. Other tests included serum and red cell cholinesterase. Samples were collected during August (start of spraying season), November (midseason) and February (end of spraying season). A multi-residue method was developed to extract organophosphate and organochlorine pesticides in whole blood. Although various methods exist, they allow only for the extraction of either organophosphates or organochlorines and not multi-residue extractions. This multi-residue method is based on the liquid/liquid extraction of a blood/Celite/ethanol mixture to extract the following pesticides: Azinphos-methyl, Chlorpyrifos, Endosulfan, Methidathion and Prothiophos. The pesticide residue levels were determined on gas chromatographs equipped with DB-5 and DB-2I0 capillary columns and flame photometric-, electron capture- and nitrogen/phosphorous detectors. The results were confirmed on a gas chromatograph with mass-selective detector in selective ion mode. Of the 402 blood samples analysed, 23 samples showed positive for organophoshates and 29 for organochlorines, and were sent for analysis on the mass spectrometer. Of those samples only one could be positively identified. The presence of the pesticide Endosulfan-B was confirmed. The confirmation of the pesticides was complicated by interfering substances that leached from the rubber stoppers of the collection vessels into the blood. Although the study showed that for practical purposes no pesticides were present, other important information was obtained about the handling and analyses of blood samples for pesticides.

Cohort study found that being insured and having longer exposure of health insurance significantly increased migrant workers' likelihood to use professional healthcare in Shenzhen, decreased their total occasions of professional healthcare utilisation, and were causally associated with a decrease in professional healthcare expenditures which were paid out-of-pocket in the 6 months of follow-up by migrant workers. / Internal migration has become a more and more prominent societal and economic phenomenon in mainland China and Shenzhen is one of the most frequently selected locales for rural-urban migrants. This thesis aims 1) to assess health status and to describe patterns of healthcare utilisation amongst migrant factory workers, 2) to follow up the sample over 6 months to understand the impact of health insurance participation on health service utilisation and health expenditures, and 3) to assess the implications for health policies. / Our results suggest that health strategies should take into consideration the specific health needs of the highly mobile factory migrant workers. Through insurance coverage, local health authorities may be able to help improve rural-urban migrant workers' health by improving services at community level, and incorporating psychological care in the services provided by Community Health Centres. / Questionnaire surveys were used in a representative sample from factory workers in Shenzhen. The baseline and follow-up studies were conducted during April to December 2009 in Shenzhen, China. / Results show that migrant factory workers in Shenzhen represent a broad combination of geographic complexity and have special socio-demographic characteristics. The results have specified some association between self-rated health and SES, and major correlates of depressive symptoms amongst migrant factory workers. The seroprevalence of antibodies to rubella amongst female migrant workers is too low to provide immunity in the population. Sex, age, education, sleeping hours and internet use were associated with being a current smoker. The crude two-week illness rate was 21.6%. More than half and 11.6% of sick migrant workers chose self-treatment or neglected their sickness, respectively. Self-perception of disease being not severe, lack of time and economic difficulties were the major explanations for not utilizing professional care. / Mou, Jin. / Adviser: Sian Meryl Griffiths. / Source: Dissertation Abstracts International, Volume: 73-02, Section: B, page: . / Thesis (Ph.D.)--Chinese University of Hong Kong, 2010. / Includes bibliographical references (leaves 253-270). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese.

Thesis (M.C.P.)--Massachusetts Institute of Technology, Dept. of Urban Studies and Planning, 1981. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ROTCH. / Includes bibliographies. / by Sonia Sylvia Jasso. / M.C.P.

Farm workers are viewed as a neglected segment in the South African society. This qualitative research study focused on exploring and describing the social needs of farm workers in the Central Koup from the perspectives of samples comprising of farm workers and farm owners and/or managers. The aim was to contribute in finding solutions to address the identified needs through employee assistance programmes (EAPs) as one of the areas that an occupational social worker focuses on. The qualitative data was collected through focus group discussions and semi-structured interviews, and the findings were verified with literature. Tesch’s framework for data analysis (in Creswell, 2003) was employed, and data verification was conducted through Guba’s model (in Krefting, 1991:214-222). The findings indicated that the social needs of farm workers could be addressed through typical EAP-related focus areas such as working- and interpersonal relationships, substance abuse, spiritual well-being, recreation, financial management, conflict management, child care and parenting skills, trauma counselling, and practical assistance regarding transport, housing and accessibility of resources. This research endeavour resulted in recommendations regarding the use of EAPs to address the social needs of farm workers. / M. Soc. Sc.

Pesticides are among the most pervasive environmental contaminants and they are an important potential risk for human health. Agricultural workers are constantly exposed to pesticide spray, drift and residues in the soil and foliage. Many agricultural pesticides are readily absorbed by the body, through contact with the skin, the respiratory track, the eyes, and the gastrointestinal system. Multiple studies have reported a strong association between pesticide exposure and various health outcomes including cancer. Oxidative stress and DNA damage have been proposed as mechanisms linking pesticide exposure to health effects and neurological diseases. The focus of the present translational study is to examine the relationship between human exposure to the organophosphate pesticide azinphos methyl (AZM) and oxidative stress by measuring biomarkers of oxidative stress in biological fluids (i.e., urine, serum) and peripheral blood lymphocytes (PBLs) of agricultural workers. The findings from these field studies will be validated in vitro by examining cultures of human lymphocytes treated with AZM for similar biomarkers of oxidative stress. Since the collection of PBLs from study participants is highly invasive and not suitable for studies involving younger subjects, we also examined buccal cells for biomarkers of oxidative stress (i.e., DNA damage) as a more universal source of human tissue to assess oxidative stress in pesticide exposed individuals. We demonstrated in this study that AZM induces oxidative stress and causes DNA damage in human tissues. Agricultural workers who had been exposed to AZM showed elevated serum levels of lipid peroxides, increased urinary levels of 8-OH-dG, and lymphocytes from these individuals showed increased DNA damage and associated changes in oxidative DNA repair enzymes. Biomarkers of oxidative stress were also elevated in human lymphocytes treated with physiologically relevant concentrations of AZM. In cultures of human lymphocytes, AZM caused a concentration-dependent loss of viability and associated increases in ROS and a reduction in intracellular GSH. We also demonstrated that viable leukocytes from the oral cavity can be readily obtained from humans and these buccal cells can be used to assess DNA damage following exposure to occupational and environmental genotoxicants. We also noted that oral leukocytes are especially sensitive to cryopreservation with DMSO and thus, these cells must be cryoprotected with 5% DMSO to preserve the viability of these cells for subsequent biochemical studies. In summary, these in vivo and in vitro studies demonstrated that AZM induces oxidative stress in a dose-dependent matter and that oral lymphocytes are a good source of human tissue for assessing DNA damage and possibly other biochemical changes. The possible health implications of the variations in these biomarkers of oxidative stress and DNA damage are undetermined. Yet the findings from these studies have provided a strong foundation for determining the mechanism by which pesticide induce oxidative stress, to explore the putative relationship between pesticide-induced oxidative stress and disease (e.g. cancer, neurodegenerative disorders) and determine whether tissue damage in humans is brought about by direct or by indirect action of organophosphate pesticides. / Graduation date: 2010

Farm workers are viewed as a neglected segment in the South African society. This qualitative research study focused on exploring and describing the social needs of farm workers in the Central Koup from the perspectives of samples comprising of farm workers and farm owners and/or managers. The aim was to contribute in finding solutions to address the identified needs through employee assistance programmes (EAPs) as one of the areas that an occupational social worker focuses on. The qualitative data was collected through focus group discussions and semi-structured interviews, and the findings were verified with literature. Tesch’s framework for data analysis (in Creswell, 2003) was employed, and data verification was conducted through Guba’s model (in Krefting, 1991:214-222). The findings indicated that the social needs of farm workers could be addressed through typical EAP-related focus areas such as working- and interpersonal relationships, substance abuse, spiritual well-being, recreation, financial management, conflict management, child care and parenting skills, trauma counselling, and practical assistance regarding transport, housing and accessibility of resources. This research endeavour resulted in recommendations regarding the use of EAPs to address the social needs of farm workers. / M. Soc. Sc.

This mixed methods research was conducted in the fall of 2014 to understand the perceptions and experiences of health risks and health outcomes due to pesticide exposure among community members (n=13) - concerned community members, agriculture workers and teachers- that live in the Central California agriculture counties of Monterey, Santa Cruz, Tulare, Fresno and Madera. This research explored: 1) The crops growing in participants’ communities, and how exposure to pesticides used in these crops pose potential health risks to participants and their communities 2) How pesticide exposure is impacting Hispanic/Latino communities in Central California, particularly those that are most vulnerable including school children, agriculture workers, and community members 3) The major public health concerns of impacted communities 4) Feelings of empowered to advocate for community health and environment and 5) What impacted communities wish to see on behalf of government and agribusiness to protect public health from pesticide exposure and toxins.