The new data suggest that public health measures aimed at preventing asymptomatic transmission are essential.
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Understanding how COVID-19 spreads can help public health officials determine how to best contain the virus and stop the outbreak. Instead, broad-scale social distancing measures are necessary. This transmission from apparently healthy individuals means that staying home when symptomatic is not enough to control the spread of COVID-19. About 40% to 80% of the novel coronavirus transmission occurs two to four days before an infected person has symptoms.
now estimate the incubation period for COVID-19 is between five and eight days and the serial interval is about four days. Using data from Tianjin and Singapore, Tindale, Stockdale et al. Scientists use this information to determine whether individuals infect others before showing symptoms themselves and how often this occurs. This period is called the serial interval. It can also show how many days pass between an infected person developing symptoms and a person they infect developing symptoms. It makes it possible to determine the disease’s incubation period, which is how long it takes to develop symptoms after virus exposure. The information collected in Tianjin and Singapore about COVID-19 is very useful for scientists.
In both cities, public health officials immediately began identifying and quarantining the contacts of infected people. By late February, Tianjin had 135 cases and Singapore had 93 cases. By the third week in January, the first cases were confirmed in Tianjin, a city in Northern China, and in Singapore, a city country in Southeast Asia. The virus quickly spread within the country and then across the globe. The first cases of COVID-19 were identified in Wuhan, a city in Central China, in December 2019.
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