Until the advent of an effective vaccine against serotype b organisms, it was
the leading cause of meningitis in children under 5 years of age in Oregon and
elsewhere. Today it is well down the listing, with S. pneumoniae now in the
lead. In Oregon, serotype b organisms have not been cultured in association
with invasive infection of normally sterile body fluids in children since 1999.
Appropriate utilization of conjugate vaccine will help to ensure that this trend
continues well into the future.