Pneumocystis jirovecii pneumonia (commonly called Pneumocystis pneumonia or PCP) is an opportunistic infection that occurs in immunocompromised individuals. Although Human Immunodeficiency Virus (HIV) infected patients with a low CD4 (cluster of differentiation 4) count are at highest risk of PCP, it is a significant cause of pneumonia in other immunodeficient patients. Non-HIV patients at risk are those with cancer, particularly hematologic malignancies, patients receiving glucocorticoids,  chemotherapeutic agents and other immunosuppressive medications, hematopoietic stem cell and solid organ transplant recipients, patients with primary immunodeficiencies, and severe malnutrition. Only a few cases have been reported in patients without any known immunodeficiency. We report the unusual case of pneumocystis pneumonia in a previously healthy non-HIV patient who was not on any
immunosuppressant.