Topic Reading-Vol.2946-5/5/2020

MEL School 三鷹


〒181-0013 東京都三鷹市下連雀3-33-13 三鷹第二ビル101

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Topic Reading-Vol.2946-5/5/2020

英語で世界を知ろう!Topic Reading

2020/05/05 Topic Reading-Vol.2946-5/5/2020

Dear MEL Topic Readers,

Critics said the flu kills more than coronavirus. Why that’s not a fair comparison — and now, it’s not even true

The basic reproduction number, or the basic reproductive ratio, denoted R0 and pronounced “R naught,” is the reproduction number that indicates how contagious an infectious disease is. R0 tells you the average number of people who will contract a contagious disease from one person with that disease. If no one has been vaccinated or previously infected, an R0 less than 1 causes less than one new infection, and the disease will decline and die out eventually. If R0 is 1, the disease will stay alive and stable but won’t spread rapidly or widely. However, if R0 is greater than 1, each infected person causes more than one new infection, and therefore, the disease will be transmitted between people and could trigger an outbreak or epidemic. For example, the R0 of measles or chickenpox is over 10, smallpox is around 5, a common cold is between 2 and 3, and the SEASONAL flu is usually less than 2. However, the R0 of COVID-19 is at least 2 and possibly 3-5.

Another problem is that the outbreak of the coronavirus doesn’t seem to be seasonal as the virus spread to the southern hemisphere where March and April are summer months. Also, while symptoms of the seasonal flu appear within a few days, it takes more than several days before noticeable symptoms appear to the infected person. In addition, a flu vaccine could weaken the symptoms, no effective vaccine for the novel virus has been developed or approved yet. All in all, coronavirus is more contagious, long-lasting, and dangerous to humans than the seasonal flu. That’s why many cities have been locked down and strict measures have been taken by the national and local governments for more than weeks, even months.

Read the article and watch the video to learn why COVID-19 is such a threatening disease.

MEL School 三鷹
住所 〒181-0013 東京都三鷹市下連雀3-33-13 三鷹第二ビル101
営業時間:電話受付15時~17時 定休日:日曜日