Incidence of Pneumococcal Meningitis in Children Less Than 5 Years of Age in Malaysia, Singapore and Thailand: A Review
Last reviewed: March 2026
Key Findings
- The incidence rate of pneumococcal meningitis in children under 5 years was highest in Malaysia (3.8–8.6 per 100,000), followed by Singapore (2.3 per 100,000), and Thailand (0.10–1.8 per 100,000).
- Only five articles and conference abstracts were identified describing the incidence of pneumococcal meningitis among children under 5 across the three countries during the review period.
- Malaysia contributed approximately 2,809 pneumococcal meningitis cases annually at the time of the review — significantly higher than neighbouring countries.
- The review highlighted a critical lack of epidemiological data on pneumococcal disease in Southeast Asia, hampering evidence-based vaccination policy decisions.
Background
Streptococcus pneumoniae (pneumococcus) is a leading cause of bacterial meningitis, pneumonia, and septicaemia in young children worldwide. Pneumococcal meningitis carries a particularly high case fatality rate and is associated with significant long-term neurological sequelae among survivors, including hearing loss, cognitive impairment, and motor deficits. The introduction of pneumococcal conjugate vaccines (PCVs) has dramatically reduced the burden of invasive pneumococcal disease in countries with established national immunisation programmes, yet many nations in Southeast Asia had not yet incorporated PCV into their routine childhood vaccination schedules at the time of this review.
The limited availability of regional epidemiological data has been a persistent barrier to informed vaccine policy decisions in the ASEAN region. This review was conducted to consolidate the available evidence on pneumococcal meningitis incidence among children under five years of age in Malaysia, Singapore, and Thailand — three countries at different stages of economic development and healthcare system maturity within Southeast Asia.
Methods
The researchers conducted a systematic literature search from April to July 2014 using the terms “pneumococcal diseases,” “meningococcal,” “pneumococcal meningitis,” and “meningococcus.” Both published articles and conference abstracts were included. The search identified a total of five relevant documents: two conference abstracts from Malaysia, one published paper from Singapore, and two published papers from Thailand. This modest yield underscored the scarcity of published epidemiological data on pneumococcal disease in the region.
Incidence Rates by Country
| Country | Incidence Rate (per 100,000 children <5 years) | Data Sources |
|---|---|---|
| Malaysia | 3.8 – 8.6 | 2 conference abstracts |
| Singapore | 2.3 | 1 published paper |
| Thailand | 0.10 – 1.8 | 2 published papers |
Malaysia
Malaysia exhibited the highest incidence range at 3.8 to 8.6 per 100,000 children under five. The data were derived from conference abstracts rather than peer-reviewed publications, suggesting that comprehensive epidemiological studies on pneumococcal meningitis in Malaysian children remained limited. The higher end of the range (8.6 per 100,000) indicated that the burden of pneumococcal meningitis may be substantially greater than previously recognised, particularly given the likely underreporting of cases in routine surveillance systems.
At the time of the review, Malaysia had not yet included pneumococcal conjugate vaccine in its National Immunisation Programme (NIP), though PCV was available through the private healthcare sector. The economic burden of pneumococcal disease — including hospitalisation costs, long-term disability care, and lost productivity — provided a compelling economic case for PCV introduction alongside the public health rationale.
Singapore
Singapore reported an estimated incidence of 2.3 per 100,000 children under five, based on a single retrospective study covering admissions at KK Women’s and Children’s Hospital from 1997 to 2004. The overall incidence of invasive pneumococcal disease (IPD) in Singapore was estimated at 13.6 per 100,000 children under five, with meningitis representing approximately 15.6% of all IPD presentations. The mortality rate among children with IPD was 6.1%, while the morbidity rate was 25.2%.
Thailand
Thailand showed the widest range of incidence estimates (0.10 to 1.8 per 100,000), reflecting heterogeneity in study methodologies and populations sampled. The lower rates observed in Thai studies may reflect both true epidemiological differences and differences in surveillance capacity and diagnostic practices compared to Malaysia and Singapore.
Vaccine Coverage and Policy Implications
The review’s findings underscored the urgent need for comprehensive pneumococcal surveillance in Southeast Asia to support evidence-based vaccination policies. Subsequent research has shown that the most common pneumococcal serotypes causing invasive disease in Malaysian children include serotypes 14 (26.9%), 6B (19.6%), 19A (11.8%), 6A (10.6%), and 19F (6.9%). The 13-valent pneumococcal conjugate vaccine (PCV13) would provide theoretical coverage of approximately 88.2% of these serotypes.
The economic case for PCV introduction was strengthened by cost-effectiveness analyses demonstrating that the substantial hospitalisation and long-term care costs associated with pneumococcal meningitis and its sequelae could be significantly offset by vaccine programme investment. Countries that have introduced PCV into routine childhood immunisation have consistently demonstrated dramatic reductions in invasive pneumococcal disease rates, both among vaccinated children and in unvaccinated populations through herd immunity effects.
Significance
This review remains an important reference in the literature on pneumococcal disease epidemiology in Southeast Asia. It has been cited by major international studies including the Lancet Global Health’s estimates of pneumococcal disease burden, systematic reviews on antimicrobial resistance patterns, and regional vaccination policy analyses. The paper’s documentation of Malaysia’s disproportionately high pneumococcal meningitis burden relative to its neighbours contributed to the ongoing policy dialogue on PCV introduction in the Malaysian NIP.
Limitations
The review was constrained by the very limited number of studies available — only five documents across three countries. The reliance on conference abstracts for the Malaysian data means that the incidence estimates may not have undergone the same level of peer review scrutiny as published journal articles. The studies covered different time periods and used varying methodologies, limiting the comparability of estimates across countries. Additionally, the review did not assess the serotype distribution or antimicrobial resistance patterns of pneumococcal isolates, which are important considerations for vaccine formulation selection.
Maimaiti N, Lotfizadeh M, et al. Incidence of Pneumococcal Meningitis in Children Less Than 5 Years Age in Malaysia, Singapore and Thailand: A Review. Malaysian Journal of Public Health Medicine. 2015;15(1):25–29.
License: Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)