Figure 2).

Presence of gastroenteritis symptoms over time – period going from seven days before baseline physician visit to 14 days after baseline physician visit (enrolment). At enrolment (day 0), the presence of symptoms for day –7 to day 0 was documented retrospectively by asking simple questions of caregivers about the presence and the onset of gastroenteritis symptoms. For day 1 to day 14, the daily presence of symptoms was documented prospectively through symptoms diary cards completed by caregivers