A new study examining air samples from hospital wards with COVID-19 patients has found the virus can travel up to 13 feet (four meters), which is twice the distance current guidelines say people should leave between themselves in public.
The preliminary results of the investigation by Chinese researchers were published on Friday in Emerging Infectious Diseases, a journal of the US Centers for Disease Control and Prevention (CDC).
The researchers, led by a team at the Academy of Military Medical Sciences in Beijing, tested surface and air samples from an intensive care unit and a general COVID-19 ward at Huoshenshan Hospital in Wuhan. They housed a total of 24 patients between February 19 and March 2.
They found that the virus was most heavily concentrated on the floors of the wards, “perhaps because of gravity and airflow causing most virus droplets to float to the ground.”
High levels were also found on frequently touched surfaces like computer mice, trashcans, bed rails and doorknobs.
“Furthermore, half of the samples from the soles of the ICU medical staff shoes tested positive,” the team wrote. “Therefore, the soles of medical staff shoes might function as carriers.”
The team also looked at so-called aerosol transmission — when the droplets of the virus are so fine they become suspended and remain airborne for several hours, unlike cough or sneeze droplets that fall to the ground within seconds.
They found that virus-laden aerosols were mainly concentrated near and downstream from patients at up to 13 feet — though smaller quantities were found upstream, up to eight feet.
(Internet inputs)