In an era of rapid and extensive globalisation, the world faces a wide range of transboundary problems that require effective collective action. Key among these are threats to human health that do not recognise national borders, and include emerging and re-emerging infections, rising rates of chronic diseases, inadequate access to affordable and safe medicines, spreading anti-microbial resistance and the health effects of climate change. These threats require a transnational response and thus pose significant challenges to global health governance, as well as to long established notions of...