Health
Surfaces play an important role in viral infections
According to a new study by UCL and Great Ormond Street Hospital (GOSH), viral DNA left behind on hospital bed rails was found in almost half of all sites sampled within 10 hours of the entire award and persisted for at least 5 days Did.
This study Journal of Hospital InfectionAims to safely simulate how the virus that causes Covid-19, SARS-CoV-2, can spread across the surface of a hospital.
Instead of using the SARS-CoV-2 virus, researchers artificially replicated some of the DNA from a plant-infectious virus that was unable to infect humans, producing 1 ml of water at a concentration similar to the found SARS-CoV-2 copy. Added to respiratory samples of infected patients.
Researchers put this DNA-containing water on the railing of a hospital bed in a quarantine room, a room for high-risk or infected patients, over the next five days at 44 sites on the ward. Was sampled.
After 10 hours, they found that the surrogate genetic material had spread to 41% of the sample across hospital wards. From bed railings to door handles, waiting room armchairs, children’s toys and playground books. It increased to 59% of sites after 3 days and decreased to 41% on day 5.
Lena Ciric, UCL Civil, Environmental & Geomatic Engineering, the lead author of the study, said: “Our research shows the important role that surfaces play in the transmission of viruses and how important hand hygiene compliance is, and cleaning.
Our agents were inoculated once per site and spread by touching the surface with staff, patients and visitors. However, patients with SARS-CoV-2 will shed the virus at multiple sites due to coughing, sneezing, and surface contact. “
Lena Ciric, Senior Researcher, University College London
The highest percentage of sites with positive surrogates was in the immediate bed space area (including nearby rooms with some other beds) and clinical areas such as treatment rooms.
On day 3, 86% of the clinical sampling sites were positive, but on day 4, 60% of the most recent bedspace sampling sites were positive.
Dr. Elaine Cloutman-Green (UCL Civil, Environmental and Geotechnical Engineering), Chief Medical Scientist at GOSH, said:
“People can become infected with Covid-19 via respiratory droplets that are produced during coughing and sneezing. Similarly, if these droplets land on a surface, a person may come into contact with the surface, the eyes, Touching the nose and mouth can cause infection.
“Similar to SARS-CoV-2, the surrogates used in the study can be removed by using disinfectant wipes or washing hands with soap and water. Cleaning and handwashing is the first defense against viruses. Means and this survey is an important memory.Medical professionals and all visitors to the clinical setting spread it through rigorous hand hygiene, surface cleaning, and proper use of personal protective equipment (PPE). Can help to stop.”
This study used viral DNA in water, whereas SARS-CoV-2 is likely to spread in body fluids such as cough droplets. Sticky liquids such as mucus can spread more easily.
One caveat in this study is how quickly the virus can spread if it is left on the surface, but it is not possible to determine the likelihood of human transmission.
Source:
See journal:
Rawlinson.S. , other.. (2020) COVID-19 Pandemic-Remember the surface. Journal of Hospital Infection.. doi.org/10.1016/j.jhin.2020.05.022.
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