Efforts to reduce hospitalization or the length of stay are common top
ics in papers published last year. Chlamydia pneumoniae is now recogni
zed worldwide as a common pathogen in community-acquired pneumonia. A
great variation in the frequency of various pathogens is found in diff
erent countries, stressing the importance of ascertaining the aetiolog
ical and epidemiological situation in each respective country. (C) 199
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