Variants of SARS-COV-2 and the Death Toll

New variants of SARS-COV-2 have been found in various countries. Especially, the UK has been attacked by India’s Delta Plus, and the spread of infection has been very rapid, since it is extremely infectious. Fortunately, however, the number of deaths has been stayed flat, where deaths are reported to be those who are not yet received a shot of COVID-19 vaccine. In this short not, we would like to consider why the number of deaths is so small, compared with high cases, around the infection peak, when the basic reproduction number is very large.