Fever persisting even after treatment of pneumonia likely diagnosis is
number of noninfectious conditions mimic pneumonia, including pulmonary edema, pulmonary embolism, lung carcinoma, radiation and hypersensitivity pneumonitis, and connective tissue disease involving the lungs. If the patient truly has CAP and empirical treatment is aimed at the correct pathogen, lack of response may be explained in a number of ways. The pathogen may be resistant to the drug selected, or a sequestered focus (e.g., lung abscess or empyema) may be blocking access of the antibiotic(s) to the pathogenref Harrison 19th edition pg 1017
Empyema
Fungal lesions
Carcinoma bronchus
Any of the above
Respiratory system