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  • Title: Rapid detection of pneumococcal antigen in serum samples for diagnosing pneumococcal pneumonia.
    Author: Domínguez J, Andreo F, Blanco S, Ruiz-Manzano J, Prat C, Latorre I, Galí N, Rivelo R, Matas L, Ausina V.
    Journal: J Infect; 2006 Jul; 53(1):21-4. PubMed ID: 16269180.
    Abstract:
    OBJECTIVES: The aim of the study is to assess the usefulness of C polysaccharide and polysaccharide capsular antigen detection by immunochromatography (ICT) and enzyme immunoassay (EIA), respectively, in serum samples for diagnosing pneumococcal pneumonia. METHODS: Adult patients included in the study were classified in the following groups: In group 1 we studied 101 serum samples from patients with pneumonia due to Streptococcus pneumoniae. In 53 cases the pneumonia was bacteremic. The second group contained 113 serum samples from patients with no pneumococcal pneumonia. Group 3 was made up of 40 serum samples from healthy subjects with no clinical or radiological signs of pneumonia. RESULTS: Using ICT, antigen was detected in 50% of patients with pneumococcal pneumonia, in 64.3 and 40.9% of patients with bacteremic and non-bacteremic pneumococcal pneumonia, respectively. Using EIA, antigens were detected in 35.8% of patients with pneumococcal pneumonia, in 45 and 22.2% of patients with bacteremic and non-bacteremic pneumococcal pneumonia, respectively. CONCLUSIONS: In conclusion, the sensitivity of the tests is low. However, in special situations, where obtaining large volume of urine is difficult, they could be a complementary method in the rapid diagnosis of pneumococcal pneumonia.
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