The term "tarhagan plague" is a tricky one in terms of spelling. The word "tarhagan" is pronounced as /ˈtɑː.hʌ.ɡən/ and similarly, the word "plague" is pronounced as /pleɪɡ/. While the phonetic transcription of each word is straightforward, the combination of the two can cause confusion in spelling. To ensure accuracy, it is best to refer to reputable sources for proper spelling, such as dictionaries or official literature on the topic.
Bubonic plague endemic in Eastern Siberia and Mongolia, so called because it attacks a species of rodent resembling a marmot, the local name of which is tarbagan.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.