Enhanced oral care cut non-ventilator hospital pneumonia by about 60%

Design

Stepped-wedge cluster-randomised trial, nine wards in three hospitals

Population

8,870 adults admitted for at least 48 hours

Primary outcome

Incidence of non-ventilator hospital-acquired pneumonia

Effect

1.00 to 0.41 per 100 admission-days; cumulative HR 0.40 (95% CI 0.19–0.82)

HAPPEN was a stepped-wedge cluster-randomised trial across nine wards in three Australian hospitals from 2024 to 2025. The intervention, delivered by research nurses, combined enhanced oral care with products, patient and staff education, and audit with feedback; the control was usual ward oral care. It analysed 8,870 adults admitted for at least 48 hours. It was published on 8 June.

Non-ventilator hospital-acquired pneumonia occurred in 1.0% under usual care and 0.7% under the intervention. Adjusted for time at risk, the rate fell from 1.00 to 0.41 per 100 admission-days (cumulative HR 0.40, 95% CI 0.19–0.82). Completion of the oral care protocol rose from 16% to 62%. Other respiratory and oral infections did not differ significantly.

Non-ventilator pneumonia is common, often unrecorded, and rarely targeted by infection prevention teams, which usually focus on ventilated patients. This is one of the few randomised trials showing a simple ward intervention reduces it. Delivery in the trial used dedicated research nurses, so the challenge for Indian wards with high patient-to-nurse ratios is making oral care routine without that support. The event count is small, which explains the wide interval.

• Add oral care to the daily nursing plan for adults admitted for more than 48 hours.
• Provide toothbrushes and oral care products on the ward rather than relying on patients to bring them.
• Audit oral care completion and feed results back to ward staff.
• Count non-ventilator hospital-acquired pneumonia as a reportable healthcare-associated infection.

Why it matters

Ward pneumonia in non-ventilated patients is common, preventable and rarely anyone's target.

Don't overread it

Dedicated research nurses delivered the intervention; routine ward staff may achieve less.

The statistics, in plain English

A hazard ratio of 0.40 means the rate of pneumonia was about 60% lower. With only 78 cases in total, the interval from 0.19 to 0.82 is wide, so the true effect could be smaller, but it is unlikely to be zero.

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