Fig. 12. Epidemic spread of adenovirus conjunctivitis, Chicago, IL, 1985-1986. Methods of transmission include a nosocomial, common-source outbreak and interpersonal spread within the community. (Reproduced by permission of the University of Chicago Press [Warren D, Nelson KE, Farrar JA, et al: A large outbreak of epidemic keratoconjunctivitis: Problems in controlling nosocomial spread. J Infect Dis 160:938, 1989].)