There had been many incidents in history when people from other continents brought outbreak of diseases along with them (for eg, diseases brought by the Spaniards to the Incas), why such things doesn’t happen today, atleast not on a large scale?
Also I’m not from science background, so sorry if the question was dumb.
In: Biology
People get sick all the time on vacation see; [travelers diarrhea](https://www.mayoclinic.org/diseases-conditions/travelers-diarrhea/symptoms-causes/syc-20352182)
For things that are more dangerous they recommend getting vaccinations.
Further, washing your hands, drinking bottled water… and other basic hygiene tricks are very very effective
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