This article explores a smattering of thematic questions that criss-cross the articles in this special pandemics issue; it signposts some reverberations, overlapping responses, and problematic comparisons currently (mid 2020) being made between past pandemics and the tense experiences (and projections going forward) of COVID-19 across the world. The historical pandemics covered here offer an entry point to a fruitful set of genealogies, chronologies, epidemiologies, trajectories, and imaginaries linked to a host of issues: what makes a pandemic ‘global’? What does a global history perspective bring to the table? How does examining germs and genomes shed light on imperialism as a/the pandemic driver? Where do animals, the environment, and ecology fit in and why are they so often excluded from pandemic histories? What counts as medical humanitarianism when health knowledge, know-how, and cooperation ‘from below’ are sidelined? And what came/comes first: a pandemic or a changed world?

Brazil has encouraged an ambitious set of policies towards the pharmaceutical industry, aiming to foster technological development while meeting health requirements. We characterise these efforts, labelled the ‘Complexo Industrial da Saúde’ (Health-Industry Complex, CIS), as an outcome of incremental policy change backed by the sustained efforts of public health professionals within the federal bureaucracy. As experts with a particular vision of the relationship between health, innovation and industry came to dominate key institutions, they increasingly shaped government responses to emerging challenges. Step by step, these professionals first made science and technology essential aspects of Brazil's health policy, and then merged the Ministry of Health's new focus on science, technology and health with industrial policy measures aimed at private firms. We contrast our depiction of these policy changes with a conventional view that relies on a partisan orientation of the executive.

Between the 1930s and 1960s Puerto Rico was transformed from a marginal United States territory into an industrialised ‘showcase of development’. This article investigates the organisation of milk station programmes on the island during this crucial period and how these reflected the circulation of child welfare knowledge, nutrition expertise and public health practices. During the Depression, these perspectives fostered a recast of the eugenic regeneration ideologies motivating medical assessments of and sanitary interventions with Puerto Rico’s rural poor since the nineteenth century. Innovations in nutrition knowledge and an emerging rural hygiene movement highlighted the negative health effects of the island’s monocrops economy. In this context, the nourishment of children’s bodies assumed symbolic and instrumental significance for the reconfiguration of colonial and developmental models promoted by the new Popular Democratic Party (PPD). The experience of public health professionals in relief work during the 1930s contributed to the articulation of food and nutrition as key elements of this party’s populist discourse. Programmes like milk stations became part of strategies to rear and manage the labour force needed in the industrial development model promoted by the PPD. From the perspective of poor Puerto Ricans, however, they were part of the materialisation of its promise of social justice for the poorer classes.