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COVID-19 on the surface: Investigation of known unknowns

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Even months after the COVID-19 pandemic, researchers say, there remains a gap in knowledge about how parameters contribute to SARS-CoV-2 infection.

A systematic review of research on surface SARS-CoV-2 found 78 articles, most of which were centered around the medical setting, but that SARS-CoV is known for virus-contaminated surfaces. It cannot be matched with the survival rate of -2. Dr. Gabriel String of Tufts University in Medford, Massachusetts reported on these surfaces.

Not only that, researchers have not yet matched this information with whether surface disinfection is effective, she said in her latest virtual presentation. Annual Meeting of the American Society of Tropical Medicine and Hygiene..

String points out that WASH interventions (water, hygiene, hygiene) are the key to preventing the transmission of the disease during outbreaks, and researchers discuss how SARS-CoV-2 can be blocked. I examined existing research.

They downloaded literature from two databases, the NIHCOVID-19 portfolio and the CDCCOVID-19 research article downloadable database, and found 78 articles that met the SARS-CoV-2 surface contamination, stability, or disinfection criteria. It was.

In 35 studies focusing on the surface per setting, the health care surface was sampled more than any other setting. The highest percentages of positives were in hospital rooms, non-home accommodations, and laboratories.

In 25 studies using samples from the hospital room, viral RNA was detected in the cup (one of two positives). Soft bedding such as pillows, sheets and covers (17 out of 42 positives). Hard bedding such as bed handles and headboards (2 out of 5 positives).

Five studies examining non-home accommodation included wooden chopsticks, patient’s personal protective equipment (two out of three positives), and electronic high-five surfaces such as computer mice and televisions (seven out of seven). ) Viral RNA was found in all 5 samples. 16 positive).

Seven studies specifically examined the duration of SARS-CoV-2 on a surface and tested 29 unique surfaces. Nine studies investigated stainless steel and plastic, but also glass, nitrile gloves, and aluminum.

String said that the “temperature and humidity range” was tested on the surface in the study, but the important point is that “as the temperature and humidity increased, the half-life of SARS-CoV-2 decreased.” was.

Twenty different disinfectants for SARS-CoV-2 were tested, most of them floating tests (89%). Nine studies focused on suspension studies found that SARS-CoV-2 reduction was dose- and contact time-dependent.

“Some disinfectants, such as heat and long contact times with hand sanitizers, showed a reduction of almost 6 logs,” she said.

According to the string, three studies focused on disinfecting SARS-CoV-2 on the surface showed a reduction of more than 4 logs with more than 60 minutes of simulated sunlight and more than 2 minutes of UV-C radiation. It was seen, but warned that the results were limited. As of July.

She also noted the heterogeneity of the study due to fluctuations in concentration and contact time, and that researchers had difficulty comparing data with different collection techniques.

“Some of these need to be standardized [testing] Method … to allow the data to be compared more broadly. “

Last updated: November 20, 2020

  • Author['full_name']

    Molly Walker Deputy Editor-in-Chief for Infectious Diseases on MedPage Today. She has a passion for evidence, data and public health. To follow

Disclosure

This study was supported by the Tisch College of Civic Life and MSF at Tufts University.



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