- Design
- Retrospective case series, national tertiary referral centre
- Population
- 39 children aged 0–15 with pneumococcal HUS in New Zealand, 2008–2024
- Primary outcome
- Presentation, serotypes, severity and kidney outcomes
- Effect
- 84% serotype 19A; 79% needed dialysis; 43% of followed survivors had CKD
A retrospective case series from New Zealand's national paediatric referral centre identified 39 children with Streptococcus pneumoniae haemolytic uraemic syndrome between 2008 and 2024. Two thirds occurred in 2020–2024, a period of rising invasive pneumococcal disease.
Median age was 18 months, and 92% presented with complicated pneumonia. Of 32 with serotype data, 84% were serotype 19A, including every case since 2020. Most children (79%) were PCV-immunised, yet only 19% had a vaccine-covered serotype. Illness was severe: 90% needed intensive care and 79% kidney replacement therapy, for a median 13 days. Two children died, two needed a kidney transplant, and 43% of survivors with follow-up had chronic kidney disease. Māori and Pacific children made up 62% of cases.
Serotype coverage matters. Where the vaccine in use does not cover 19A well, this complication can rise even in a well-vaccinated population. In India, which PCV formulation a child received will shape the risk.
- In a young child with complicated pneumonia, check for anaemia, low platelets and rising creatinine — they may signal pneumococcal HUS.
- Check a blood film and urine output early in empyema or necrotising pneumonia.
- Being PCV-immunised does not exclude pneumococcal HUS; serotype 19A predominated.
- Arrange long-term kidney follow-up after pneumococcal HUS; four in ten survivors had chronic kidney disease.
- Know which serotypes your local PCV covers — 19A coverage differs between vaccines.
Why it matters
A severe complication is rising with a serotype that some vaccine schedules cover poorly, and most affected children were vaccinated.
Don't overread it
A single-country case series of 39 children cannot show why cases rose or what share of pneumonia leads to HUS.
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