The goal of the commission, launched in March 2005, is to strengthen health equity by catalysing policy and institutional change to address the social determinants of health.

We describe a number of pitfalls that may occur with the push to rapidly expand access to antiretroviral therapy in sub-Saharan Africa. These include undesirable opportunity costs, the fragmentation of health systems, worsening health care inequities, and poor and unsustained treatment outcomes. On the other hand, AIDS "treatment activism" provides an opportunity to catalyze comprehensive health systems development and reduce health care inequities.However, these positive benefits will only happen if we explicitly set out to achieve them. We call for a greater commitment toward health activism that tackles the broader political and economic constraints to human and health systems development in Africa, as well as toward the resuscitation of inclusive and equitable public health systems.

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Contributors RL initiated a draft of key conceptual points to which all authors inputted and which was used to prepare an early draft. All authors made text input to iterative drafts and provided reference materials using shared online document editing software. RL coordinated the inputs and edited the final manuscript.

Responses to COVID-19 have included top-down, command-and-control measures, laissez-faire approaches, and bottom-up, community-driven solidarity and support, reflecting long-standing contradictions around how people and populations are imagined in public health-as a 'problem' to be managed, as 'free agents' who make their own choices, or as a potential 'solution' to be engaged and empowered for comprehensive public health. In this rapid review, we examine community-engaged responses that move beyond risk communication and instead meaningfully integrate communities into decision-making and multi-sectoral action on various dimensions of the response to COVID-19. Based on a rapid, global review of 42 case studies of diverse forms of substantive community engagement in response to COVID-19, this paper identifies promising models of effective community-engaged responses and highlights the factors enabling or disabling these responses. The paper reflects on the ways in which these communityengaged responses contribute to comprehensive approaches and address social determinants and rights, within dynamics of relational power and inequality, and how they are sometimes able to take advantage of the ruptures and uncertainties of a new pandemic to refashion some of these dynamics.