Pneumococcal HUS: think of it when a child with complicated pneumonia turns pale

Design

Retrospective national case series, single tertiary centre

Population

39 children aged 0–15 with pneumococcal HUS, New Zealand, 2008–2024

Primary outcome

Presentation, serotype, severity and long-term kidney outcome

Effect

ICU 90%, kidney replacement 79%, death 5%; CKD in 43% of followed survivors; serotype 19A 84%

This retrospective series from New Zealand's national paediatric referral centre described 39 children with Streptococcus pneumoniae haemolytic uraemic syndrome between 2008 and 2024. Two-thirds of cases came from 2020 onwards, in a period of rising invasive pneumococcal disease.

Median age was 18 months and 92% presented with complicated pneumonia. Illness was severe: 90% needed intensive care, 79% needed kidney replacement therapy (median 13 days), 5% died and 5% later needed a kidney transplant. Of survivors followed up, 43% had chronic kidney disease. Serotype 19A caused 84% of typed cases and all cases since 2020. 79% of the children had been vaccinated, but only 19% of typed cases were vaccine-covered serotypes, reflecting the local vaccine in use.

This is one country's series, but the clinical lesson is general. In a young child with pneumonia or empyema, new pallor, falling platelets, rising creatinine or reduced urine output should prompt a blood film and haemolysis screen. Long-term kidney follow-up is needed even after apparent recovery. Which serotypes the vaccine covers determines protection.

• Check haemoglobin, platelets, creatinine and a blood film in a child with complicated pneumonia who becomes pale or oliguric.
• Consider pneumococcal HUS especially in children under two with complicated pneumonia.
• Discuss early with a paediatric nephrology and intensive care team; most needed dialysis.
• Arrange long-term kidney follow-up, as 43% of survivors had chronic kidney disease.
• Know which pneumococcal serotypes your local vaccine covers, including 19A.

Why it matters

It is rare, severe and easily mistaken for sepsis-related kidney injury, and recognition changes management.

Don't overread it

This is a 39-child case series from one country; it does not give incidence or prove a vaccine effect.

The statistics, in plain English

These are counts and proportions in a small series, not rates in the population. With 39 cases, each child is about 2.5 percentage points, so the proportions are imprecise.

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