Of course it doesn't 'work '. People should really understand what they are reading , it is an experimental gene therapy treatment that aids the body in the production of a 'covid spike protein' to mitigate the effects of the sars-cov 2 virus, no where in any literature is it shown to be able to actually inhibit or prevent transmission. The actual term used in the official pfizer-biotech website is ".... may prevent transmission" , so may hiding in the closet, wearing 3 masks, and putting a finger up my jacksie ....