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SARS-CoV-2 outbreaks that cannot be explained by large droplets and contact with surfaces alone. Droplets from speech can float in air for eight minutes.
A growing body of evidence suggests beyond any reasonable doubt that the virus spreads indoors through tiny aerosols—a finding that should be reflected in the WHO’s recommendations.
Like the flu, COVID-19 is spread primarily via respiratory droplets—little blobs of liquid released as someone coughs, sneezes, or talks. Viruses contained in these droplets can infect other people via the eyes, nose, or mouth—either when they land directly on somebody’s face or when they’re transferred there by people touching their face with contaminated hands.
One proposed alternative route SARS-CoV-2 may take to reach a new host is fecal-oral transmission, which is thought to have played a role in the spread of SARS. A couple of studies documented viral RNA in the feces of infected people. These results indicated along with respiratory system, digestive system is a potential routes for 2019-nCov infection.
(https://www.biorxiv.org/content/10.1101/2020.01.30.927806v1)
In addition, concerns about vertical transmission (in which a mother passes the virus to her fetus or newborn) were reported. One recent study of nine pregnant women with COVID-19 failed to find evidence of vertical transmission. researchers reported that, in all nine women, who had a caesarean section in their third trimester, amniotic fluid, cord blood, breastmilk, and the newborn babies tested negative for the virus. (https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(20)30360-3/fulltext).
Compelling evidence and computer model prove that the simple formula to stop Covid19 spread is always social distance in public and, most importantly, wear a mask.
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