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Current British guidelines need revision
| The first 150 words of the full text of this article appear below. |
Community acquired pneumonia is the most common reason for acute admission to hospital, with an estimated 50 000 cases occurring each year in the United Kingdom.1 Over 90% of these patients are aged over 65 years and the associated mortality is 16-40%.2 Streptococcus pneumoniae is still the most common causative organism, probably responsible for up to 40% of cases; Mycoplasma pneumoniae (3-23%), Haemophilus influenzae (5-8%), and Legionella pneumophila (3-6%) are the next commonest.2 "Atypical" pathogens are, however, becoming more prominent in old people, and current guidelines on antibiotic treatment may not be appropriate in this age group.
Until recently pneumonia due to atypical pathogens has been considered
uncommon in old people: a review of 11 studies of pneumonia identified
Chlamydia and Coxiella spp as the cause
in only 2% of patients aged over 65.2 However, recent
studies have documented Chlamydia pneumoniae in up to
26% of cases, which suggest it is the second