This data visualization was created using data from FluTrackers, the World Health Organization and the Korean Broadcasting System (KBS).
Wherever possible, the dates are those for a case's onset of illness, but if that is unavailable then the date for hospitalization or if that is unclear, the date that case was reported.
Because the WHO obviously have more detailed information, I recommend you keep an eye on their site, so long as it is being maintained, for more accurate epidemic curves.
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References...
1. FluTrackers' line list of MERS-CoV around the world
https://flutrackers.com/forum/forum/novel-coronavirus-ncov-mers-2012-2014/146270-2012-2015-case-list-of-moh-who-novel-coronavirus-mers-ncov-announced-cases?t=205075
https://flutrackers.com/forum/forum/novel-coronavirus-ncov-mers-2012-2014/146270-2012-2015-case-list-of-moh-who-novel-coronavirus-mers-ncov-announced-cases?t=205075
2. The Korean Broadcasting System's News websites
http://dj.kbs.co.kr/resources/2015-06-08/ &
http://dj.kbs.co.kr/resources/2015-06-04/
http://dj.kbs.co.kr/resources/2015-06-08/ &
http://dj.kbs.co.kr/resources/2015-06-04/
3. World Health Organization pages
Main landing page on MERS and MERS-CoV (includes link to WHO line list under General Information)
http://www.who.int/emergencies/mers-cov/en/
Disease Outbreak News pages
http://www.who.int/csr/don/don_updates/en/
News on the current situation
http://www.wpro.who.int/outbreaks_emergencies/wpro_coronavirus/en/
Summary of Korean statistics-rapidly updated
http://www.wpro.who.int/outbreaks_emergencies/summary.of.MERS.stats/en/
Main landing page on MERS and MERS-CoV (includes link to WHO line list under General Information)
http://www.who.int/emergencies/mers-cov/en/
Disease Outbreak News pages
http://www.who.int/csr/don/don_updates/en/
News on the current situation
http://www.wpro.who.int/outbreaks_emergencies/wpro_coronavirus/en/
Summary of Korean statistics-rapidly updated
http://www.wpro.who.int/outbreaks_emergencies/summary.of.MERS.stats/en/