From: Two variants among Haemophilus influenzae serotype b strains with distinct bcs4, hcsA and hcsB genes display differences in expression of the polysaccharide capsule
Capsule locus type
Time period of isolation
Patient's age
No. of strains
I
II
1983–1995
All
388
368
20
≤ 4 years
255
235
> 4 years
133
0
1996–2006
282
281
1
143
142
139