An оlder аdult pаtient hаs been in the hоspital fоr 3 days following an ORIF of the left hip. Upon assessment this morning, the patient has developed a productive cough, fever (101.8°F), wheezes and crackles in the right lower lobe. Vital signs include, HR- 98, RR- 24, BP- 98/62, SPO2- 90% on RA. A chest x-ray confirms the presence of a right lower lobe pneumonia. The nurse knows which type of pneumonia is most likely in this patient?