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http://www.who.int/news-room/fact-sheets/detail/measles
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2. US Centers for Disease Control and Prevention. Measles (rubeola)/frequently asked questions about measles in the US.
https://www.cdc.gov/measles/about/faqs.html
. Accessed 18 Dec 2018.
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https://www.usnews.com/news/articles/2016-09-27/measles-declared-eradicated-in-the-americas
. Accessed 18 Dec 2018.
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http://www.euro.who.int/en/media-centre/sections/press-releases/2018/measles-cases-hit-record-high-in-the-european-region
. Accessed 18 Dec 2018.
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