Table 1.

Difference of pneumonitis and pneumonia associated with Immune checkpoint inhibitors.

	Pneumonitis	Pneumonia
Cause	Immune checkpoint inhibitors	Infection including Bacteria, fungus, viruses
Symptoms	Shortness of breath, dry cough (occasionally, low-grade fever)	Coughing up sputum, shortness of breath, fever (or no sputum or fever)
Symptom duration	Weeks, months or even lifelong if it becomes chronic	A week to few months
Diagnosis	CT, PFT(pulmonary function test), lung biopsy	X-ray, blood and sputum culture, etc
Primary mechanism	Autoimmune(not clearly) and inflammation	pulmonary inflammatory response to mainly bacteria and bacterial products, etc
Treatment	Steroids, oxygen	Antibiotics, anti-viral, anti-fungal therapy, etc