The Frequency of Positive Challenge Test to Penicillin in Children Suspected to Have Allergy to Penicillin

children who are suspected to have penicillin allergy due to a suspected allergic reaction during penicillin treatment are sent for allergy investigation to role out allergy. Patients go through penicillin test and if negative are challenged by oral administration under medical observation. The investigators would like to check the incidence among our pediatric pediatric patients.