What organism is the most common opportunistic pathogen that routinely infects patients with HIV/AIDS?

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Pneumocystis jirovecii is the most common opportunistic pathogen that infects patients with HIV/AIDS. It often causes a severe form of pneumonia known as Pneumocystis pneumonia (PCP). Mycoplasma pneumoniae is a common cause of community-acquired pneumonia in immunocompetent individuals, but it is not an opportunistic pathogen. Serratia marcescens is an opportunistic pathogen but it is not commonly associated with infections in HIV/AIDS patients. Respiratory syncytial virus is a common cause of respiratory infections in young children, but it is not an opportunistic pathogen in HIV/AIDS patients.

What Organism Is the Most Common Opportunistic Pathogen That Routinely