Fig. 1

Individual follow-up and hospital admissions for non-measles infectious diseases by current age and by time relative to measles in children hospitalized for measles in Ho Chi Minh City, 2005–2015. Negative value of time indicates time before measles admission. Each dot represents a hospital admission that occurred at that age and time relative to measles admission. Each grey diagonal line represents an individual’s follow-up period. For clarity, some patients were randomly chosen to be illustrated in black diagonal lines. The density graphs represent the number of individuals at risk at that age (top) or time (right); purple: before measles, red: after measles