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
In this day and age, with jet travel, most viruses and bacteria that spread human-to-human have already made it around the world and you’ve encountered most stuff that could survive in your part of the world. They’re not too dangerous to you because your immune system has seen it in one shape or form.
There are still plenty of diseases that are still geographically isolated, like yellow fever in tropical areas of Africa and South America, and you are encouraged to get vaccinated for them when traveling there. In the case of yellow fever, it’s spread by a mosquito that doesn’t survive outside of those areas.
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