Table 1.

Pneumococcal serotypes of 49 cases of pneumonia with pleural effusion as determined by multiplex immunoassay directly on pleural fluids

SerotypeNo. of positive samplesNo. of positive samples confirmed by isolation of S. pneumoniae from pleural fluidb
3132
19A11 (7 + 4)a
7F/A71
161
6B11
81
33F/A1
Nontypeable9 (13 − 4)a
Total49
  • a Four samples contained nondetectable amounts of capsular PS but were found to contain DNA of serotype 19A capsule synthesis gene locus by PCR.

  • b Serotyping results of all 5 available isolates agreed with direct typing results of pleural fluids.