Prior tensions have blunted the chances for a co-ordinated response to covid-19—and both countries are fighting a grand ideological battle alongside an epidemiological one. India has so far reported few covid-19 cases; we explore the systemic concerns that would make a large outbreak there staggeringly deadly. And, a failed attempt to tame the notorious traffic of Lagos. For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/radiooffer