In 2015, South Korea experienced an outbreak of Middle East respiratory syndrome, or MERS.
Between May and July, 186 people contracted the MERS virus; 38 eventually died.
This diagram shows how quickly the pathogen spread within and between hospitals via a handful of “superspreaders.”
Credits: T.H. Saey, Maimuna Majumder, S. Egts
Sources: FluTrackers.com, World Health Organization, South Korean Ministry of Health, ProMED-Mail