RT Journal Article
SR Electronic
T1 Serotype prevalence in adults hospitalised with pneumococcal non-invasive community-acquired pneumonia
JF Thorax
JO Thorax
FD BMJ Publishing Group Ltd and British Thoracic Society
SP 540
OP 545
DO 10.1136/thoraxjnl-2011-201092
VO 67
IS 6
A1 Bewick, Thomas
A1 Sheppard, Carmen
A1 Greenwood, Sonia
A1 Slack, Mary
A1 Trotter, Caroline
A1 George, Robert
A1 Lim, Wei Shen
YR 2012
UL http://thorax.bmj.com/content/67/6/540.abstract
AB Background The distribution of pneumococcal serotypes implicated in non-invasive community-acquired pneumonia (CAP) in adults is currently unknown.Methods A prospective observational cohort study was conducted over 2 years in a large UK teaching hospital trust. Urine samples, in addition to routine blood and sputum samples, were obtained from consecutive adults admitted to the hospital with CAP. Pneumococcal serotype was determined from urine samples using a validated multiplex immunoassay which detects 14 serotypes.Results Of 920 patients with CAP, 366 had pneumococcal CAP; 242 had a serotype determined. Thirty-day mortality was 10% for all-cause CAP and 9.6% for pneumococcal CAP. Annual incidence of pneumococcal CAP was 36.5 per 100 000, increasing from 12.1 to 274.1 per 100 000 for ages 16–44 years and ≥85 years, respectively. The most prevalent serotypes were 14, 1, 8, 3 and 19A. Less invasive serotypes were significantly associated with increasing age (OR per increasing age group: 1.5, 95% CI 1.2 to 1.9, p<0.001) and co-morbidity (OR per increasing Charlson index group: 1.4, 95% CI 1.0 to 2.0, p=0.036), and with higher 30-day mortality (OR adjusted for age and co-morbidity: 5.5, 95% CI 1.2 to 25.3, p=0.028) compared with highly invasive serotypes. The proportion of patients in whom serotypes contained within the seven-valent childhood pneumococcal conjugate vaccine was identified increased with age (15.6% for patients aged 16–44 years, 41.0% for patients aged ≥85 years; p<0.05).Conclusions In adult invasive and non-invasive pneumococcal CAP, the most common serotypes implicated were 14, 1, 8, 3 and 19A. Age and co-morbidity were associated with the distribution of serotypes identified.