Research from the Netherlands has suggested that measles is a much more problematic infection than had been supposed (https://www.theguardian.com/science/2019/oct/31/measles-wipes-out-immune-systems-memory-study-finds). The infection seems to wipe out much of the immune system's 'memory' of past exposures. This is another reason why declines in the take up of MMR vaccinations is likely to prove hazardous.
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