In rheumatic fever ,should we do skin sensitivity test every time after any injection im penicilin or in the first time only?

?: If you have a known life-threatening allergy to penicillin, a skin sensitivity test can trigger it so isn't entirely safe. You should take sulfadiazine, not PCN. If you're not known to be allergic, you can simply receive Penicillin as serious allergy is rare and your doctor should have the expertise to reverse a mild allergy if it occurs. If uncertain, a short acting PCN should be tried, not IM.