Study: HEPA Air Purifiers Fail to Stop Respiratory Germ Spread in Nursing Homes

Dr. Robert W. Powitz of the INDEX Board of Directors called our attention to the study below. His contact info is below.

A recent study published in JAMA Internal Medicine suggests that portable HEPA air purifiers failed to reduce respiratory infections in nursing homes, but experts argue these results are primarily due to poor implementation rather than equipment failure. While laboratory data shows these devices can capture nearly all viral particles, “real-world” challenges in the study—such as units being frequently turned off, kept on low settings to minimize noise, or being too small for the rooms—severely limited their effectiveness. The research highlights a critical gap between technical capability and practical adherence, illustrating that air filtration only provides a health benefit when machines are properly sized and consistently operated. Ultimately, the text serves as a cautionary tale for public health, emphasizing that environmental interventions require both scientific rigor and manageable daily protocols to protect vulnerable populations.

PLOS One Paper: https://doi.org/10.1371/journal.pone.0347989

Study:  Implementation and acceptability of high efficiency particulate air filters to reduce respiratory infections in care homes: Process evaluation of the AFRI-c cluster randomised controlled trial

Scientists:

Sophie Rees

Ruth Kipping

Rachel C. M. Brierley

Clare Clement

Nicholas Turner

Eleanor Gidman

Karen Sargent

Jane Sprackman

Alastair D. Hay

Published: July 27, 2026

Cited by:

Dr. Robert W. Powitz
Forensic Sanitarian
R.W. Powitz & Associates, PC
P.O. Box 502
Old Saybrook, CT  06475-0502
(O) 860-388-0893; (C) 860-395-9214
Powitz@sanitarian.com
http://www.sanitarian.com