These injections are not like inactivated pathogen vaccines because they teach your own cells to generate the "invader" which causes your immune system to attack any cells that are producing this protein. Instead of attacking the pathogen directly, whichever cells the mrna packets are being delivered to are being targeted. Aka ovaries, heart, liver...
Never been to cdmx but mexico is much more than one city. Lots of nice places and nice people in different areas.