Table 1.

Overview of strains used: species, serotype, number of strains, and origin of strain.

Species	Serotype(s)	Number	Origin
S. pneumoniae	19F	1	ATCC 49619
S. pneumoniae	4	1	TIGR4 (a gift of R. Hakenbeck, Karlsruhe, Germany)
S. pneumoniae	1, 3, 4, 5, 8, 14, 20, 38, 11B, 12F, 15B, 15C, 16F, 17F, 18C, 19F, 22F, 23F, 24F, 35F, 6B, 7F, 9N, 9V, 10A, 11A, 15A, 19A, 23A, 6A, 9A,	3 each	Clinical isolates from invasive pneumococcal disease (IPD) (i.e., septicemia, meningitis, and septic pneumonia)
S. pneumoniae	12A, 33A	2 each	Clinical isolates from IPD
S. pneumoniae	34	1	Clinical isolate from IPD