Patients with laboratory-confirmed shigellosis who enrolled after 1 May 2002 were visited on days 3, 7, 14 and 90 after presentation. At these follow-up visits, a questionnaire was completed that recorded demographic information, past medical history, intercurrent events since presentation and planned management. No additional specimens were obtained during these visits. (Before 1 May 2002 there was no structured follow-up schedule so no data are available for patients
presenting before this date.)