Guidelines for severe community-acquired pneumonia in the western world.

Background: Recently, several guidelines (ATS 1993/IDSA 1998; ERS 1998; SWAB 1998) have been issued for the initial therapy of patients with community-acquired pneumonia. In patients who fulfil the criteria for severe community-acquired pneumonia (SCAP), it was advised to start with a macrolide (active against Legionella spp. and Mycoplasma pneumoniae) in combination with an agent active against both pneumococci and Pseudomonas aeruginosa by the ATS/IDSA guidelines, while the ERS suggested starting with a second or third generation cephalosporin, in combination with either a macrolide or second generation quinolon plus or minus rifampicin.