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In order to slow the spread of the CoViD-19 pandemic, governments around the world have enacted a wide set of policies limiting the transmission of the disease. Initially, these focused on non-pharmaceutical interventions; more recently, vaccinations and large-scale rapid testing have started to play a major role. The objective of this study is to explain the quantitative effects of these policies on determining the course of the pandemic, allowing for factors like seasonality or virus strains with different transmission profiles. To do so, the study develops an agent-based simulation model, which explicitly takes into account test demand and behavioral changes following positive tests. The model is estimated using data for the second and the third wave of the CoViD-19 pandemic in Germany. The paper finds that during a period where vaccination rates rose from 5 to 40%, seasonality and rapid testing had the largest effect on reducing infection numbers. Frequent large-scale rapid testing should remain part of strategies to contain CoViD-19; it can substitute for many non-pharmaceutical interventions that come at a much larger cost to individuals, society, and the economy. [ABSTRACT FROM AUTHOR]

This cross-sectional study investigated a model of risk and protective factors of the family, school, and peer environment that predict adolescent delinquent behaviour. Three social groups were compared: newcomer ethnic German adolescent immigrants, experienced ethnic German adolescent immigrants, and native adolescents. Based on theoretical assumptions about processes of acculturation, it was hypothesized that the strength of associations between the variables in the theoretical model would vary between newcomer immigrants and native adolescents and also between newcomer and experienced immigrants, but would be similar for experienced immigrants and native adolescents; these hypotheses were supported. Findings suggest that certain risk factors, such as parental violence and involvement with delinquent peers, are more strongly related to delinquency among newcomer immigrants than among experienced immigrants and native adolescents, whereas certain protective factors, such as parental knowledge and school bonding, seem to be relevant for experienced immigrants and native adolescents only. Results seem to indicate that migration can be seen as phase transition with a stronger impact of risk factors on the development of delinquency among newcomer immigrant adolescents. This has implications for studying acculturation processes in immigrant groups as well as for group-specific intervention programmes.