During the early period of the Yi Dynasty, medical texts such as the Hyangyak chipsong pang indicate a dawning recognition that measles was a disease that could be separated from smallpox. Seventeenth-century Korean texts described a "dot-eruption disease" that appears to be measles. However, doctors seemed to have had difficulty securing knowledge of this eruptive disease, suggesting that epidemics of measles were rare. It is worth noting that Ho Chun suggested that the "poisonous epidemic of the T'ang"

that occurred in 1613 was similar to measles, but was a separate disease. This epidemic may have been scarlatina, as doctors were unable to differentiate between scarlatina and measles.

Subsequent medical books say nothing significant or new about the "dot-eruptive disease" until the eighteenth century, when doctors influenced by the "School of Positivism" began to write specialized medical texts based on their own experiences and case studies. A measles outbreak that occurred in 1707 stimulated interest in the disease, and several specialized books on measles were written in response to the epidemics of 1752 and 1775. Such texts provided comprehensive discussions of the symptoms and treatment of measles and smallpox, and made it possible for doctors to differentiate the eruptive diseases.

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