Table 4

Proportion of laboratory confirmed cases amongst primary (first) cases in families of pertussis cases in PICU and wards

Relationship	PICU	Ward	Total
Parent	9/10	2/3	11/13
Sibling	0/7	2/3	2/10
Baby or co-primary	6/8	2/2	8/10
Total	15/25	6/8	21/33