A comparison of the ImmuView® S. pneumoniae and L. pneumophila
Urinary Antigen Test results with the combined results of the two
BinaxNOW® kits using the 99 L. pneumophila cases and the 71 culture
confirmed S. pneumonia cases results in an overall sensitivity of 87.1%
for the ImmuView® and 74.1% for the combined BinaxNOW® kits.
Results are shown in Fig. 1.
The specificity of the ImmuView® S. pneumoniae and L. pneumophila
Urinary Antigen Testwas investigated by testing 76 urines frompatients
with culture confirmed urinary tract infections. These samples were
all negative for L. pneumophila, but one sample was positive for
S. pneumoniae. This gave a 100% specificity for L. pneumophila, and 99%
specificity for S. pneumoniae. All 76 samples were negative using the
two BinaxNOW® kits. The positive sample was from a patient with
urinary tract infection caused by Klebsiella pneumoniae. All together,
three K. pneumoniae positive patients were tested, of which only one
sample was positive. A co-infection with both K. pneumoniae and
S. pneumoniae cannot be ruled out.