Investigations

• chest x-ray ^a  

Look for a lobar infiltrate ^c

Why?

• A lobar infiltrate makes pneumococcal pneumonia more likely ^c
• A multilobar infiltrate increases the risk of dying before discharge ^b

A multilobar infiltrate increases the risk of dying

Patient	Prognostic Factor	Outcome	CER	OR (95% CI)	NNF+ (95% CI)
community-acquired pneumonia b	multilobar radiographic pulmonary infiltrate not independent	death at ? days	14%	3.9 (1.9 to 5.1)	7 (4 to 30)