Washington (AFP): scientists have known for several months, the new coronavirus can be suspended in microdroplets excluded patients when they talk and breathe, but still there was no evidence that these tiny particles are infectious.
A new study conducted by researchers from the University of Nebraska, which was uploaded on the website of the medical working paper of this week showed, for the first time that SARS-cov-2 are taken from the microdroplets, which are defined as under the age of five microns, can replicate in the laboratory.
This strengthens the hypothesis that normal speak and breathe, not just coughing and sneezing, are responsible for the distribution of Covid-19-and that infectious doses of virus can overcome the distance a lot more than six feet (two meters) called the guiding principles of social distancing.
The results are still considered preliminary and has not yet appeared in a peer-reviewed journal, which will give more confidence to the methods developed by scientists.
The document was posted on the website medrxiv.org where the most advanced research during the pandemic was first published.
The same team wrote a paper in March showed that the virus remains in the air in the rooms of hospitalized Covid-19 patients, And this study will soon be published in the journal, according to the lead author.
“It’s actually quite difficult” to collect samples, said Joshua Santarpia, adjunct Professor at the University of Nebraska medical center ORP.
The team used a device the size of a cellular telephone for this purpose, but “concentrations are generally very low, your chances of recovery material small.”
Researchers took air samples from five rooms of bedridden patients, at the height of about a foot (30 centimeters) of the feet on my bed.
Patients were told that produces microdroplets, which become suspended in the air for several hours in what’s called “aerosols”, and some coughing.
The team managed to collect microdroplets as small as one micron in diameter.
Then they put the samples in the culture to get them to grow, to discover that three of the 18 samples tested were able to reproduce.
For Santarpia, this is proof that microdroplets that also travel much greater distances than large droplets, can infect people.
“It replicates in cell culture and therefore infectious,” said he.
The potential for transmission of coronavirus microdroplets were at some stage were incredible health authorities around the world.
Later, scientists started to change their opinion and admit it can be a challenge, which is the basis for the universal camouflage.
The world Health Organization was one of the last, changing his position, doing so on 7 July.
“I feel that the debate has become more political than scientific,” said Santarpia.
“I think that most scientists who work on infectious diseases agree that there likely is an air component, although we can argue about what size”.
Linsey Marr, a Professor at Virginia tech who is the leading expert on aerial transmission of viruses and was not involved in the study, said it was rare to get measuring the amount of virus present in the air.
“Based on what we know about other diseases and what we know so far about SARS-cov-2, I think we can assume that if the virus is infectious in aerosols, then we can be infected through inhalation,” said she. – AFP