Fig. 1

Research topics clustered by mapping of co-occurrences of terms in title/abstract for publications related to COVID-19. Of the 20,897 terms, 721 terms have occurred at least 10 times. For each of the 721 terms, a relevance score was determined and used to select the 60% most relevant terms. The size of the circles in Fig. 1 represents the occurrences of terms in title/abstract. The largest set of connected terms consists of 433 terms in four clusters: Clinical features studies (red), pathological findings and therapeutic design (blue), care facilities preparation and infection control (green), and maternal, perinatal and neonatal outcomes (yellow)