Reference	Objective	Design	Evidence
Aspa et al. [406]	Drug‐resistant pneumococcal pneumonia: clinical relevance and related factors	PCS	3A+
Bonnard et al. [407]	Community‐acquired bacteraemic pneumococcal pneumonia in adults: effect of diminished penicillin susceptibility on clinical outcome	PCS	3B?
Falco et al. [408]	Influence of penicillin resistance on outcome in adult patients with invasive pneumococcal pneumonia: is penicillin useful against intermediately resistant strains?	PCS	3A+
Lujan et al. [409]	Prospective observational study of bacteraemic pneumococcal pneumonia: effect of discordant therapy on mortality	PCS	3B?
Plouffe et al. [410]	Azithromycin in the treatment of Legionella pneumonia requiring hospitalization	PCS	3A+
Sabria et al. [411]	Fluoroquinolones vs. macrolides in the treatment of Legionnaires disease	PCS	3A+
Yu et al. [412]	Levofloxacin efficacy in the treatment of community‐acquired legionellosis	MA	1A+
Peterson et al. [186]	Penicillins for treatment of pneumococcal pneumonia: does in vitro resistance really matter?	MA	1A+