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Clinical use of antibiotics is becoming more widespread with each passing day for various infectious diseases. This has caused an abrupt increase in hypersensitivity reactions linked to these drugs, sometimes preventing the use of first-line therapies. In these patients, clinical presentation may vary from mild skin infections to life-threatening anaphylactic reactions. Our patient is a 30 year old female with past medical history significant for mast cell activation syndrome and multiple autoimmune diseases who presented with chief complaint of fever. Patient was diagnosed with MSSA bacteremia requiring the start of an antibiotic regimen. Mariana castells protocol was used for desensitizing the patient before starting her on antibiotic regimen. Patient was desensitized in 2 days using the standard 12-step protocol and started on cefazolin for her long-term treatment of the infection. No acute episodes of drug …