The new coronavirus which causes COVID-19 has a median incubation period of 5.1 days, Johns Hopkins researchers found. Other human coronaviruses that cause common colds have mean illness-incubation periods of about 3 days.
The new coronavirus SARS-CoV-2, which causes the respiratory illness COVID-19, has a median incubation period of 5.1 days, according to a study released late Monday led by researchers at Johns Hopkins Bloomberg School of Public Health. While a shorter incubation period is better to slow the spread of the virus, this estimate also suggests it could be up to two weeks.
The incubation period directly influences how fast an outbreak spreads: If people get sick sooner, they obviously won’t be working, shopping or flying on airplanes and, thus, less likely to spread the virus. The study suggests that people could still be walking around with no symptoms or very mild symptoms, without realizing that they were carriers of the disease.
Also see: ‘We’re going to have more deaths.’ Influenza kills more people than coronavirus so everyone is overreacting, right? Wrong — here’s why This estimated incubation period for COVID-19, is similar to that of SARS-CoV, an outbreak centered in southern China and Hong Kong from 2002–2004. MERS-CoV, a coronavirus that has caused hundreds of cases in the Middle East — with fatality rate of 35%, higher than the estimated rate of 2% to 3.4% for COVID-19 — has a mean incubation period of around 5 to 7 days.
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