FIG. 4.

Association of preexisting serum antibodies with less severe vomiting. The titers of rotavirus-specific antibodies in acute-phase sera from 31 children for whom detailed symptom scores during the course of illness or on the day of the first blood sample collection were available were determined as described in the text. IgG titers ≥100 and IgM titers ≥200 were significantly associated with a shorter duration of vomiting (A) and a lack of vomiting (B), respectively. The median numbers of days of vomiting in the groups of subjects are indicated by dashed lines.