Dennis Fujita
The fast transmission and high contagiousness characteristic of SARS-CoV-2 detected in Wuhan, China was determined by first studies that concluded, in a serial interval of 6-9 days, a median R0 value of 5.7 (95% CI 3.8? 8.9) of human to human transmission, that alerted to the rapid domestic spread potential in China by travels, an increased risk factor due to the proximity of the new year celebrations in China. As a respiratory virus infection, the transmission occurs by direct or indirect contact, usually by droplet spray in short range or aerosol in long range transmission. Some international health government agencies, advice to keep a safe distance from person to person of 6 feet to avoid respiratory droplets produced by talk, sneeze or coughs, with usually occurs in larger respiratory droplets (>5 ?m) with a reduced life time in air and perform small distances. The study of Setti et al. indicates that distance is safe only if everybody wears face masks due to the virus can be in aerosolized droplets for 10 meters and remain viable up to 3 hours, when Virus-laden small (
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