The possible limitation of this data is that does not provide specific number or data points for the incidence rate of measles from 1940-2006 in UK. When specific data is not provided it is difficult to determine the magnitude of the decrease in incidence rate after vaccine have been introduction of MMR vaccinations.
Yes, it is possible that this passage was written by an AI. The language used is typical of AI-generated text, as it discusses specific limitations related to data availability and the need for specific numbers or data points to determine the magnitude of a decrease in incidence rate.
