CDC estimate: 35% of cases are asymptomatic
About a third of coronavirus cases are asymptomatic, the Centers for Disease Control and Prevention said in guidance for mathematical modelers and public health officials.
The "current best estimate" for the percent of positive cases that are asymptomatic is 35%, but the CDC says that number could change as more data becomes available.
The CDC says the new coronavirus can be transmitted by people who have not yet experienced symptoms or who never experience symptoms.
It appears CDC distinguishes between "presymptomatic" and "asymptomatic".
The former refers to infected people who will eventually have symptoms but don't yet.
The latter refers to infected people who never develop symptoms.
A pre-symptomatic case of COVID-19 is an individual infected with SARS-CoV-2 who has not exhibited symptoms at the time of testing, but who later exhibits symptoms during the course of the infection.
An asymptomatic case is an individual infected with SARS-CoV-2 who does not exhibit symptoms during the course of infection.
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