Evaluate the burden of invasive group B streptococcal (GBS) disease in young infants (up to 90 days of age) in China, in terms of incidence, case fatality rate and serotype distribution

Inclusion Criteria:

1. Positive culture for GBS from one or more of the following normally sterile sites: blood, cerebrospinal fluid (CSF), pleural fluid, peritoneal fluid, pericardial fluid, surgical aspirate, bone, joint fluid, suprapubic bladder aspiration or internal body site (e.g., lymph node, brain).
2. ≤90 days old at the time of GBS confirmation.
3. Voluntary written informed consent provided.

Exclusion Criteria:

• None.

Infants (up to and including 90 days of age) born in or treated in a study hospital