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Back then, diseases often spread much more slowly, if at all, due to the limited transportation methods.
by danielrpa 7y ago
Back then, diseases often spread much more slowly, if at all, due to the limited transportation methods.
- jedberg 7y agoI don’t think that’s true at all. It just takes one person to start a new city. After that transportation doesn’t really matter. For reference, only 20% of the world’s population has ever flown in airplane. In 2020 there will be about 40 million flights. In 1965, when the measles vaccine was first introduced, there were about 5 million flights, and about 1/2 the world population. But in both cases the majority of those flights were by the wealthiest people in the world. So really not a significant difference in travel. If anything it would be density that would be the problem, since a lot more people live in cities now.