please check whether these investigations has been carried out or not-Serum chemistry panel (sodium, potassium, bicarbonate, blood urea nitrogen , creatinine, glucose)
Arterial blood gas (ABG) determination (serum pH, arterial
oxygen saturation, arterial partial pressure of oxygen and carbon dioxide) – Hypoxia and
respiratory acidosis may be present.
Venous blood gas determination (central venous oxygen saturation)
Complete blood cell (CBC) count with differential
Serum free cortisol value
Serum lactate level
A
pulse oximetry finding of
Blood cultures
Sputum Evaluation
Chest Radiography
Bronchoscopy With or Without BAL
Thoracentesis
use this tool to calculate risk associated -https://internalmedicine.osu.edu/pulmonary/cap/10675.cfm
Treatment -a)Respiratory support
b)Fluid resuscitation
c)Empiric antibiotic therapy
d)Corticosteroids
e)Drotrecogin alfa
Discuss with your local doctor regarding these basic points (Thanks)