Travel and the daily movement of people mean that the measles virus can spread very quickly, from one environment to another. The mere introduction of the virus does not necessarily lead to further spread; what is crucial is how well the population is protected by vaccination.
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Travel and the daily movement of people mean that the measles virus can spread very quickly, from one environment to another. The mere introduction of the virus does not necessarily lead to further spread; what is crucial is how well the population is protected by vaccination.