Coronavirus could travel up to 4 meters from patient, says Chinese study
The main mode of spread of the new coronavirus is the relatively large droplets produced when coughing or sneezing.
The new SARS-CoV-2 coronavirus contaminates both surfaces and air near patients, and up to four meters from them, according to a study carried out in a Wuhan field hospital and published by the Centers on Friday American Disease Prevention and Control (CDC).
An important limitation of the study, published by the CDC journal Emerging Infectious Diseases, is that the test used detects the presence of the virus, but not the quantity of viable virus. In other words, just because the virus ejected into the air by sneezing or breathing patients can fly up to four meters does not mean that there will be enough of these particles to infect someone.
Samples from the prefabricated hospital.
Chinese researchers took samples from an intensive care unit (15 patients) at the Huoshenshan field hospital in Wuhan between February 19 and March 2, as well as from a general care unit with less serious patients (24 patients). ).
This is the prefabricated hospital which had been built in 10 days by an army of workers at the start of the epidemic in the city. Samples were taken from the floors, computer mice, trash cans, bed rails, patient masks, caregiver protective equipment, air vents, as well as from the air in the rooms. several places.
"SARS-CoV-2 was widely distributed in the air and on the surface of objects in the intensive care and general care departments, which implies a potentially high risk of contamination for healthcare workers and other close contacts"
, write the researchers.
The most contaminated areas were near intensive care patients. The most contaminated objects were mice, followed by garbage cans and beds and door handles.
But half of the soles of the nursing staff's shoes also had traces of the virus. "We strongly recommend that people disinfect the soles of their shoes before leaving services where Covid-19 patients are found," the researchers conclude. They also recommend disinfecting the masks after use, before throwing them away.
Microscopic droplets
The virus has also been detected in the air: more often near the patient's bed than near doctors' workstations. But they found it once four meters from the patient, which makes them write that "the maximum transmission distance of an aerosol of SARS-CoV-2 could be four meters".
The virus was also found on the air vent through which room air is exhausted. Given the significant contamination of the patient environment, the researchers believe that "isolating people with a suspected Covid-19 at home may not be an effective control strategy."
The main mode of spread of the new coronavirus is the relatively large droplets produced when coughing or sneezing.
But we also emit microscopic droplets by speaking and breathing, and the presence of sufficient coronavirus inside these droplets (aerosols) is the subject of intense scientific debate.
As a precaution, the United States has recommended covering their faces to prevent people with the virus but without symptoms from infecting others by talking or breathing.
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