In this article, I trace how the race-making of people, viruses, and the places they share became a powerful means by which Chinese public health professionals made sense of two major infectious outbreaks that threatened to stall or interrupt China's development: the SARS outbreak of 2003 and the H1N1 influenza pandemic of 2009. By inscribing geographical stability onto infected bodies in motion through the languages of race and genetics, Chinese public health professionals sought to constrain the mobility of infection and, in doing so, to contain the symbolic and material threats to China's modernity and development that flu-like infections, and the people who carried and spread them, had come to represent. While SARS in this imaginary became a BChinese^or BCantonese^disease, H1N1 became a EuroAmerican disease that, when it reached inside China, adhered more easily to those Chinese who did not quite belong. In constructing this imaginary, public health professionals' racialization of certain groups thought to be infectious joined with the racialization of the infections themselves. H1N1 could not easily infect most Chinese because both the virus and its hosts were racially alien.When the H1N1 influenza pandemic began spreading around the world in April 2009, I was nearing the end of a year of ethnographic fieldwork at several local, governmentaffiliated public health institutions in and around Tianmai, China. 1, 2 Tianmai is a large St Comp Int Dev (2015) 50:500-518 1 While readers familiar with China may have little trouble recognizing the city I call Tianmai, I use this pseudonym in the interest of providing some basic protections to my informants, who in other work have disclosed potentially sensitive information that they did not want directly linked to them or their place of work. 2 I conducted participant observation, as well as semi-structured, open-ended, and life history interviews, with over 100 informants at over a dozen government-affiliated public health institutions at the provincial, city, district, and community levels in Tianmai and the nearby city of . By Bgovernment-affiliated^I mean that these institutions were neither arms of the government per se nor were they independent of the government. Rather, they were funded by and overseen by local (municipal, district, and Bstreet^-level) governments while maintaining a quasi-independent status as a Btechnical work unit^(shiye danwei).