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The construction of public problems has a lasting influence on implementation in a given policy subsystem. National and sociopolitical contexts influence issue definition differently across nations. However, the degree to which nation‐specific issue definition takes place has been insufficiently explored. In recent years, the growing incidence of autism has led to a quest for causal factors. One hypothesis posits that the use of mercury in vaccines may be a culprit. This paper examines the definition of the mercury and autism issue in Australia, Canada, the United Kingdom, and the United States. Insights into the comparative elements of issue definition are suggested by the case. These insights are of particular importance to administrators, as agencies are deeply involved as objects and actors in the process of issue definition and are often responsible for implementing new and redefined policies.

HIV/AIDS has a severe impact on food security, affecting all of its dimensions: availability, stability, access, utilization. FAO recognizes that HIV/AIDS is a determining factor for, as well as a consequence of, food insecurity. Although the relationships among gender, food security and rural livelihoods have been acknowledged in the growing literature on HIV/AIDS impacts, relatively few studies provide adequate focus and empirical evidence on the gender aspects of these interrelationships among vulnerable rural households. Such gender aspects of these relationships have been explored in detail by FAO in Namibia, Uganda and Zambia This paper presents the main findings of the four baseline studies and discusses the methodologies used to identify vulnerable households and document changes in resource availability, household labour force, livelihood strategies, coping strategies and food security status. These findings offer useful insights for policy formulation purposes and for the development of mitigation strategies that respond to the food security challenges of the epidemic.

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