Who knows what vaccinations are needed to travel to São Paulo?
It depends on the purpose.
No need for anything. Optional for yellow fever.
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Immigration
@Alexander: This is too general a concept. If you travel to another country, some need to show a vaccination certificate against yellow fever. If you are going to study at school, other vaccinations are needed. If you are going to treat someone for smallpox, then there must be immunity from others.
@GS: I will be studying at school, I plan to arrive in San Paolo.