1. World Health Organization. New measles surveillance data for 2019. Apr 2019. https://www.who.int/immunization/newsroom/measles-data-2019/en/.
2. Measles cases in Europe tripled from 2017 to 2018
3. World Health Organization. Distribution of measles cases by country and by month, 2011-2019. Apr 2019. https://www.who.int/immunization/monitoring_surveillance/burden/vpd/measlescasesbycountrybymonth.xls?ua=1.
4. Centers for Disease Control and Prevention. Measles cases in 2019. Apr 2019. https://www.cdc.gov/measles/cases-outbreaks.html.
5. New York City mayor declares measles public health emergency