BANGKOK (The Nation/ANN): Only a place that has been free from a Covid-19 case for 28 days can be considered a safe zone, Dr Yong Poovorawan, expert virologist at Chulalongkorn University, said.
The doctor said through his social media account that a safe zone is always a place which is free from a disease for two times the incubation period.For example in the case of SARS, a safe zone is an area where a SARS case is not found for 20 days, since the incubation period is 10 days.
In the case of Covid-19, the safe zone must be areas where Covid-19 is not found for 28 days, since its incubation period is 14 days. - The Nation/Asia News Network
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