Table 1.

Occurrence of Pen V–induced Active Fatal Anaphylaxis in W/W^v Mice

Mice		Mortality
		no. of dead/total
+/+		9/9
W/Wv		14/14

Mice were sensitized by intraperitoneal injection of 500 μg of Pen V–OVA plus 2 × 10⁹ B. pertussis and 1.0 mg of alum. Challenge was given as an injection of 100 μg i.v. of Pen V–BSA 14 d later.