Among the measures to combat COVID-19, vaccines are being the most successful. In fact, all people who have obtained an emergency permit are very effective in preventing death, significantly reduce the risk of developing a serious illness and are even able to some extent to interrupt transmission. In addition, at present they protect against all the variants that have been exposed.
However, with the increased incidence, more and more infections are being diagnosed among vaccinees. Some of them have had to be hospitalized and cases of death have been reported. Some have therefore questioned the effectiveness of vaccines.
That was to be expected. Moreover, they have announced that, before much, most hospitalized people will be integrated people. And because age influences covid-19 so much, it will be almost all the elderly. There will also be deaths. This does not mean that vaccines are not effective.
This false impression can be explained by the discharge of the lung. The mathematician, Javier Alvarez Liébana, on Twitter, equated car accidents: most of those who enter the car due to accidents wear a seat belt. In fact, those who don't have a belt are more at risk of dying and they don't get to the hospital. Therefore, the hospitalized did not come to her even though they carried her belt, but carried her dressed.
The same applies to vaccines. Therefore, in addition to the spread of vaccination, it is important that initiation be as low as possible to protect the most vulnerable.