The agegroup 20-29 contains most infected people, who don't have any of the symptoms! They visit their grandparents and infect them. See the test results of South Korea (broad testing) compared to the results of Italy (only testing whe symptoms are present).


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It seems 20 somethings are not afraid to catch this thing....  

But for people over 50 this is deadly. 

Source: https://twitter.com/Paul_VanDerMeer/status/1238959209372409856?s=20

An asymptomatic carrier (healthy carrier or just carrier) is a person or other organism that has become infected with a pathogen, but that displays no signs or symptoms.

Although unaffected by the pathogen, carriers can transmit it to others or develop symptoms in later stages of the disease. Asymptomatic carriers play a critical role in the transmission of common infectious diseases such as typhoid, C. difficile, influenzas, and HIV. While the mechanism of disease-carrying is still unknown, researchers have made progress towards understanding how certain pathogens can remain dormant in a human for a period of time.  A better understanding of asymptomatic disease carriers is crucial to the fields of medicine and public health as they work towards mitigating the spread of common infectious diseases.

Source: https://en.wikipedia.org/wiki/Asymptomatic_carrier

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