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. 2021 Jan 8;11:51. doi: 10.1038/s41598-020-80214-3

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Annual incidence rate of measles in US residents and the percentage of imported cases between 2001 and 2019. (b) Annual incidence rate of measles in US residents and the percentage of vaccinated cases between 2001 and 2019. The red line represents the annual incidence rate (AIR) per million population and the blue connected line represents the percentage of imported cases and vaccinated respectively. Missing data on the percentage of vaccinated US resident cases for 2016 and 2017 in Fig. 2b. There was a decrease in the percentage of imported cases from 46.6% in 2001 to 6.3% in 2019.