Researchers from the University of Nebaska evaluated the initial isolation of 13 individuals with COVID in a medical center of the entity to detect the contamination that they carried out. In the same it was verified that in the air and surface samples that were taken there was viral contamination, which shows the way the virus spread.
It was already generally known and after the evidence over the months, recommendations have been implemented to prevent the spread of the SARS-CoV-2 virus through respiratory drops to the surrounding air when coughing or sneezing. However, there are still aspects that have not been fully verified by specialists.
In early July, more than 200 scientists published a letter to the World Health Organization asking them to recognize the risks of airborne transmission of covid. Aerosols are small respiratory particles that humans emit when they speak, sing, cough, breathe or sneeze that mix with the air and remain for a period of time compared to the largest drops that quickly fall to the ground, explains the portal The Conversation.
The university study looked at 13 people with a confirmed prognosis for covid who were evacuated from the Diamond Princess cruise ship. Those requiring hospital care were cared for in the Nebraska Biocontainment Unit (NBU) and the mildly ill were isolated in the National Quarantine Unit (NQU).
"The surface and aerosol samples were analyzed by RT-PCR targeting the SARS-CoV-2 E gene. Of the 163 samples collected in this study, 121 (72.4%) had a positive PCR result for SARS-CoV-2 "he refers.
It was determined that 70.6% of all the personal items sampled were positive for the virus and of the cell phone samples they were 77.8% positive for viral RNA, while the remote controls for televisions in one room were 55, 6% of the positive samples. Samples were also taken of the floor under the patient beds and the vents in the NBU. The five floor samples as well as 4 of the 5 ventilation grille samples tested positive for RT-PCR.
"Despite widespread environmental contamination and limited SARS-CoV-2 aerosol contamination associated with people hospitalized and with minor illnesses, the implementation of a standard set of infection prevention and control procedures avoided any documented case of COVID- 19 in health workers, "emphasizes the study.
Health personnel in that setting used N95 respirators, in addition to being highly trained and having frequent environmental cleaning.
One of the strategies to avoid aerosol contamination is to keep the spaces with as much ventilation as possible so that the concentration is reduced and air recirculation is avoided. As well as avoiding spending too much time in those settings. (I)