Invasive Pneumococcal Disease (IPD) Case Surveillance
Invasive pneumococcal disease (IPD) is a serious infection caused by Streptococcus pneumoniae invading a normally sterile site such as blood or cerebrospinal fluid. It has been a statutorily notifiable disease in Hong Kong since 2015. Below are the monthly confirmed case counts published by the Centre for Health Protection.
Monthly confirmed cases (latest month)
7cases
- Up from 6 in the same month last year
Monthly confirmed cases — full history (since 2024)
Interpretation
Monthly confirmed cases have risen for 1 consecutive months. The monthly total remains below the highest on record (31 cases, December 2024).
By age group (cumulative)
- 65 and above114
- 18–4961
- 5–1746
- 50–6444
- 2–423
- Under 22
Since 2024, the 65 and above group has had the most cases (114), reflecting older adults and young children as higher-risk groups.
Common serotypes (cumulative)
Streptococcus pneumoniae has over 90 serotypes. Their distribution determines the coverage of pneumococcal vaccines (such as the 13-, 15- and 20-valent conjugate vaccines) and is a key input to vaccination strategy.
- Serotype 3112
- Serotype 15A23
- Serotype 15B15
- Serotype 23A15
- Serotype 19A14
- Serotype 1411
The most common over the period is serotype 3, with 112 cases (about 39% of all cases).
Historical comparison
Highest month on record
31cases
Reached in December 2024
Typical seasonal peak
December
Based on data since 2024, cases are on average highest in this month (avg 23).
Methodology & definitions
A case is a laboratory-confirmed invasive infection with Streptococcus pneumoniae isolated from a normally sterile site such as blood or cerebrospinal fluid. IPD has been statutorily notifiable since 2015; the figures are monthly confirmed notified cases.
Counts are split by month of confirmation and patient age group, and the causative serotype is recorded; "Others" and "Unknown" denote serotypes not separately listed or not identified. Figures reflect actual notifications and may be revised slightly as laboratory and reporting timing settles.
Centre for Health Protection, Department of Health — Invasive Pneumococcal Disease (monthly)
Publicly released via data.gov.hk · data.gov.hk dataset
Update frequency: monthly
Data up to 6/2026
This page presents population-level disease surveillance reflecting overall trends. It is not a diagnosis or personal health-risk assessment and is no substitute for professional medical advice. Read the medical disclaimer →
Pneumococcal disease and influenza often rise together in winter, and both are vaccine-preventable.
See flu surveillance →