An environmental determinant of viral respiratory disease

ABSTRACTThe evident seasonality of influenza suggests a significant role for weather and climate as one of several determinants of viral respiratory disease (VRD), including social determinants which play a major role in shaping these phenomena. Based on the current mechanistic understanding of how VRDs are transmitted by small droplets, we identify an environmental variable, Air Drying Capacity (ADC), as an atmospheric state-variable with significant and direct relevance to the transmission of VRD. ADC dictates the evolution and fate of droplets under given temperature and humidity conditions. The definition of this variable is rooted in the Maxwell theory of droplet evolution via coupled heat and mass transfer between droplets and the surrounding environment. We present the climatology of ADC, and compare its observed distribution in space and time to the observed prevalence of influenza and COVID-19 from extensive global data sets. Globally, large ADC values appear to significantly constrain the observed transmission and spread of VRD, consistent with the significant coherency of the observed seasonal cycles of ADC and influenza. Our results introduce a new environmental determinant, rooted in the mechanism of VRD transmission, with potential implications for explaining seasonality of influenza, and for describing how environmental conditions may impact to some degree the evolution of similar VRDs, such as COVID-19.

Time as a Social and Environmental Determinant of Health for Rural Women

Background. Time insufficiency is frequently cited as a reason for poor dietary habits. This does not adequately explain the variations in how time is perceived as a factor in healthy eating. Aims. This study placed the eating behaviors of rural Australian women within the contexts of their stories to understand the factors that influenced healthy eating and how rural communities could enhance their health and well-being. Method. A three-phase sequential multimode narrative inquiry was used within four communities in rural Queensland, Australia. Each phase used a different mode of data collection: photo elicitation focus groups, narrative interviews, participatory workshops. Data were thematically analyzed iteratively to inform subsequent phases. Results. Nine final themes were identified. This article explored the theme of time and two contrasting perceptions of time sufficiency regarding healthy eating within a rural context during a drought. Discussion. Exploration of “time as a commodity” and “time as a duty” allowed a deeper understanding of time as a social and environmental determinant of health. Conclusion. Time’s influence on healthy eating is much more than the minutes it takes to prepare a meal. To fully appreciate its impact, time should be considered as a social and environmental determinant of health.

Protecting health from metal exposures in drinking water

Drinking water is essential to us as human beings. According to the World Health Organization “The quality of drinking-water is a powerful environmental determinant of health” (