TABLE 4.

Frequency of Reactions to Cephalosporins Among Patients With a History of Penicillin Allergy81

DrugNo History of Penicillin AllergyHistory of Penicillin AllergyP Value
No. of PatientsReaction to Cephalosporins, No. (%)No. of PatientsReaction to Cephalosporins, No. (%)
Cephalexin657373 (1.1)695 (7.2)<.0001
Cephaloridine10 96792 (0.8)25520 (7.8)<.0001
Total17 540165 (0.9)32425 (7.7)<.0001