When a host cell is infected (penetrated) by the coronavirus, the virus duplicates itself in about 12 hours (with the help of the host cell). The new virus particles duplicate itself again the next cycle. With one virus particle, you will have 2, 4, 16, 256, 65536, 4294967296, etc. virus particles. When there is no place in the cell for so many virus particles, they will be booted out of the cell and the host, and those will be used to infect other hosts, like you and I.
The vaccination program in many countries is going very bad. From the 17 monitored countries, only the US has 7.05 million people vaccinated, China 4.5 million, the UK with 1.5 million and Israel 1.2 million. The rest of the countries much less. Worldwide, 18.9 million people are vaccinated for the COVID-19 virus, 0.24% of the world population, 523,836 people per day. Only Israel has 13.5% of its population vaccinated This is interesting, because we can see if the vaccine has already some effects on the mortality numbers.