Of the people in Tokyo who were confirmed to be infected with the new coronavirus in the two and a half months until the 15th of this month, about 20% were asymptomatic when they were found to be positive, and the percentage of those who were asymptomatic by age group. According to a survey by the city, it was higher in the age groups after the 60s than in the 20s and 30s.


A person in charge of the city said, "I want you to take thorough infection prevention measures on a daily basis, recognizing that you may be infected not only by young people but also by asymptomatic people in a wide range of age groups."

When the city investigated 51,848 people who were confirmed to be infected in the two and a half months from November last year to the 15th of this month in Tokyo, 10,315 people were asymptomatic when the test was positive. It was a person.



It accounts for 19.9% ​​of the total, which is about 1 in 5 people.

The most asymptomatic people were 2262 in their 20s.



In addition, there are 1754 people in their 30s, 1546 people in their 40s, 1304 people in their 50s, 742 people in their 60s, 587 people in their 70s, and 441 people in their 80s.



People in their 20s and 30s make up nearly 40% of the total.

On the other hand, looking at the asymptomatic proportion of people confirmed to be infected by age group, 16.8% were in their 20s and 16.6% were in their 30s.



In contrast, 20.9% of people in their 60s, 21.6% of people in their 70s, and 24.4% of people in their 80s, and the percentage of people in the older generation who were asymptomatic was higher than that in the younger generation.



A person in charge of the city said, "It is important to prevent the spread of infection from asymptomatic people. We recognize that it is possible to be infected not only by young people but also by asymptomatic people in a wide range of ages, and prevent infection on a daily basis. I want you to take thorough measures. "



He added, "Especially at facilities for the elderly who have been found to be infected, we want them to carry out tests as soon as possible to find asymptomatic people and reduce the risk of spreading the infection."

Expert "Elderly people can get worse at first, even if they are asymptomatic."

Takao Oomagari, director of the National Center for Global Health and Medicine, who analyzes the status of infections in Tokyo, told NHK that "I don't like this disease even if it is asymptomatic. This epidemic cannot be suppressed unless infections from humans are prevented. Regardless of age or generation, living with a proper mask even if there are no symptoms. 3 Dense place If you don't have the confidence to avoid it, you need to take measures such as not going out. "



He added, "Elderly people may be asymptomatic at first, but eventually they may develop symptoms and become so bad that they need to be hospitalized. Older people are more likely to get worse."



He added, "If this epidemic occurs, it is not strange for anyone to have a coronavirus, so I would like you to prepare by simulating how to deal with it at facilities for the elderly."



Regarding the number of infected people in Tokyo these days, "The numbers seem to be calm compared to last week, but I can't read what will happen. What we haven't experienced so far has continued for a long time. The situation hasn't changed. I can't let my guard down and I can't have strange wishful thinking. "