In 1965, French microbiologist André Lwoff was awarded the Nobel Prize in Physiology or Medicine for his work on lysogeny—one of the two types of viral life cycles—which resolved a contentious debate among scientists about the nature of viruses. A Tale of Two Viruses is the first study of medical virology to compare the history of two groups of medically important viruses—bacteriophages, which infect bacteria, and sarcoma agents, which cause cancer—and the importance of Lwoff’s discovery to our modern understanding of what a virus is. Although these two groups of viruses may at first glance appear to have little in common, they share uniquely parallel histories. The lysogenic cycle, unlike the lytic, enables viruses to replicate in the host cell without destroying it and to remain dormant in a cell’s genetic material indefinitely, or until induced by UV radiation. But until Lwoff’s discovery of the mechanism of lysogeny, microbiologist Félix d’Herelle and pathologist Peyton Rous, who themselves first discovered and argued for the viral identity of bacteriophages and certain types of cancer, respectively, faced opposition from contemporary researchers who would not accept their findings. By following the research trajectories of the two virus groups, Sankaran takes a novel approach to the history of the development of the field of medical virology, considering both the flux in scientific concepts over time and the broader scientific landscapes or styles that shaped those ideas and practices.

Ninety years after the discovery of human influenza virus, Modern Flu traces the history of this breakthrough and its implications for understanding and controlling influenza ever since. Examining how influenza came to be defined as a viral disease in the first half of the twentieth century, it argues that influenza’s viral identity did not suddenly appear with the discovery of the first human influenza virus in 1933. Instead, it was rooted in the development of medical virus research and virological ways of knowing that grew out of a half-century of changes and innovations in medical science that were shaped through two influenza pandemics, two world wars, and by state-sponsored programs to scientifically modernise British medicine. A series of transformations, in which virological ideas and practices were aligned with and incorporated into medicine and public health, underpinned the viralisation of influenza in the 1930s and 1940s. Collaboration, conflict and exchange between researchers, medical professionals and governmental bodies lay at the heart of this process. This book is a history of how virus researchers, clinicians, and epidemiologists, medical scientific and public health bodies, and institutions, and philanthropies in Britain, the USA and beyond, forged a new medical consensus on the identity and nature of influenza. Shedding new light on the modern history of influenza, this book is a timely account of how ways of knowing and controlling this intractable epidemic disease became viral.