We continue (Ref. 1 : Proc. Jpn. Acad. Ser. B 97 , 22–49) to analyze the COVID-19 status. We concentrate on the following issues in this work: 1. Effect of vaccination against the spreading of SARS-CoV-2. 2. General landscape of the world situation concerning vaccinations. 3. Some aspects of the new variants of SARS-CoV-2. Our findings include: 1. With vaccinations, it is fair to say that we have entered a new phase in the fight against the virus SARS-CoV-2. We have analyzed some preliminary data to find how vaccinations can be effective against COVID-19 spreading. This analysis is based on, and is a continuation of, our first paper quoted in Ref. 1 . 2. If Tokyo (or Japan) continues to keep its vaccination schedule (starting in early April, 2021 and finishing it for elderly, 65 or older, in 4 months), it will see a sign of control of the virus in early June, 2021 although we see changes of this status due to new, more contagious variants. 3. The strength (parameter β) of a new contagious variant can be estimated based on the initial data on the variant (Section 5).
【저자키워드】 COVID-19, SARS-CoV-2, vaccination, variant, 【초록키워드】 variant, virus, variants, Japan, change, Vaccinations, Analysis, Tokyo, strength, Older, SIGN, Preliminary data, contagious, spreading, parameter, PROC, Section, variants of SARS-CoV-2, vaccination schedule, Effect, effective, initial, analyzed, concerning, Ser, 【제목키워드】 Effect, vaccination against COVID-19,