• First wave: A drill in December enabled South Korea's effective response to the coronavirus: "We were blind luck."

Asymptomatic patients with Covid-19 are driving a surge in new cases in South Korea, thwarting efforts to control transmission from the Asian country that managed to keep infections under control in previous outbreaks.

South Korea reported 569 new cases this Thursday, a level not seen in nearly nine months, as it grapples with the

third wave

of the pandemic that appears to be worsening despite tough new social distancing measures.

With young people at the center of the increase,

South Korean

health authorities

estimate that asymptomatic patients now account for 40% of all infections, a steep 20-30% increase since June.

This confirms research that approximately one in five infected people will generally experience no symptoms.

The rate is much lower in

China

, where the state disease control center said in February that about 1% of the more than 70,000 cases it analyzed were asymptomatic.

In

Tokyo

, about 19% of patients are asymptomatic.

According to the criteria of The Trust Project

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