Final answer:
Pneumocystis jiroveci pneumonia (PCP), caused by the fungus Pneumocystis jirovecii, is the parasitic infection associated with AIDS that leads to pneumonitis, hepatitis, and encephalitis. It affects those with weakened immune systems, especially AIDS patients, and requires prompt treatment with TMP/SMZ to prevent fatality.
Step-by-step explanation:
The protozoal (parasitic) infection associated with AIDS that can produce pneumonitis, hepatitis, and encephalitis is Pneumocystis jiroveci pneumonia (PCP). This disease is caused by the fungus Pneumocystis jirovecii, which primarily affects patients with compromised immune systems, such as those with AIDS. While P. jirovecii was previously thought to be a protozoan, it has been reclassified as a fungus. It lives in the lung tissue and can be transmitted from person to person. Infected individuals display symptoms like fever, cough, and shortness of breath.
If left untreated, Pneumocystis pneumonia can often be fatal, necessitating prompt treatment with combination drug trimethoprim-sulfamethoxazole (TMP/SMZ). Due to potential severe side effects of sulfa drugs, treatment should be carefully monitored.