A landmark study suggests that HEPA air filters do not stop people from catching infectious respiratory diseases in care homes. According to the report, a large trial found no evidence that the devices reduced respiratory infections in that setting, casting doubt on a widely held belief about their role in infection control.
Air-cleaning devices gained strong support during the COVID pandemic, when schools and care homes were encouraged to install them as a way to lower the spread of airborne illness. The new findings challenge that push by indicating that, at least in care homes, HEPA filtration did not translate into fewer infections.
The result is significant because HEPA filters have often been treated as an important protective measure against respiratory disease transmission. This study instead points to a gap between the theory behind cleaner indoor air and the real-world outcome of whether fewer people actually become ill.
While the findings directly relate to care homes, they are likely to influence the broader debate over how effective air filters are for preventing infectious respiratory diseases. The study adds weight to calls for infection-control policies to be guided by large trials and measured outcomes rather than assumptions alone.
