Hospital room surfaces pose low risk of spreading SARS-CoV-2

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Hospital rooms where COVID patients were treated had little to no active virus contaminations on surfaces, according to a study at Duke University Hospital that adds to the body of research on how the pandemic respiratory virus is spread.

The finding, published online in the journal Clinical Infectious Diseases, concludes that contaminated surfaces in the are unlikely to be a source of indirect transmission of the virus.

"Early on in the pandemic, there were studies that found that SARS-CoV-2 could be detected on surfaces for many days," said the study's senior author Deverick Anderson, M.D., professor in the Department of Medicine at Duke. "But this doesn't mean the virus is viable. We found there is almost no live, infectious virus on the surfaces we tested."

Anderson and colleagues, working under the CDC Prevention Epicenters Program, tested a variety of surfaces in the rooms of 20 COVID patients at Duke University Hospital over several days of hospitalization, including on days 1, 3, 6, 10 and 14.

Samples were collected from the patients' bedrail, sink, medical prep area, room computer and exit door handle. A final was collected at the nursing station computer outside the patient room.

PCR testing found that 19 of 347 samples gathered were positive for the virus, including nine from bedrails, four from sinks, four from room computers, one from the medical prep area and one from the exit door handle. All nursing station computer samples were negative.

Of the 19 positive samples, most (16) were from the first or third day of hospitalization.

All 19 positive samples were screened for infectious via cell culture with only one sample, obtained on day three from the bedrails of a symptomatic patient with diarrhea and a fever, demonstrating the potential to be infectious.

"While are routinely cleaned, we know that there is no such thing as a sterile environment," Anderson said. "The question is whether small amounts of viral particles detected on surfaces are capable of causing infections. Our study shows that this is not a high-risk mode of transmission."

Anderson said the findings reinforce the understanding that SARS-CoV-2 primarily spreads through person-to-person encounters via respiratory droplets in the air. He noted that people should concentrate on known anti-infection strategies such as masking and socially distancing to mitigate exposures to airborne particles.

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Study confirms the low likelihood that SARS-CoV-2 on hospital surfaces is infectious

More information: Bobby G Warren et al, SARS-CoV-2 Environmental contamination in hospital rooms is uncommon using viral culture techniques, Clinical Infectious Diseases (2022). DOI: 10.1093/cid/ciac023
Journal information: Clinical Infectious Diseases

Provided by Duke University
Citation: Hospital room surfaces pose low risk of spreading SARS-CoV-2 (2022, January 19) retrieved 29 May 2022 from
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