Fig. 2

The most frequent MeSHs assigned to the coronavirus-related articles before and during the COVID-19 epidemic.

Desired MeSH subheadings were searched in the articles that have the term “coronavirus” in their “title/abstract” and indexed in the year 2019 and 2020 (up to 10th April). MeSH terms were used as the indicator of the articles’ topics. The left and right columns show the number of records, and the lines connect the same subheadings in these 2 years. In the figure, the terms “organization,” “numerical data,” and “prevention” stand for organization & administration, statistics & numerical data, and prevention & control, respectively