Fig. 3

Global transmission patterns of DENV-1 at the subgenotype level. a The transmission patterns assessed by phylogeographical inferences using the Bayesian stochastic search variable selection (BSSVS). 29 subgenotypes of DENV-1 and 67 involving epidemic countries/areas were included, under the condition of the subgenotypes of DENV-1 with > 20 strains as well as the viral lineage transmission with the binary indicator (I) > 0.50 and Bayes factor (BF) > 6. The pies represent the country/area circled with the coloured composition of subgenotypes involving in transmission. The gray dotted oval lines show the twelve belonging epidemic regions. The names of countries/areas with ≥ 5 transmission pairs are shown in red, and ≥ 10 pairs in bold red. WAFR, West African Region; RSR Red Sea Region; SWIO, Southwest Indian Ocean; SASC, South Asia Subcontinent; GMS-China, Great Mekong Subregion-China; SEA Southeast Asia; PHI, Philippines; TWP, Tropical Western Pacific; OCE, Oceania; CNA, Central North America; CAR, Caribbean; SA, South America. b The alluvial plot indicates the subgenotype flow of DENV-1 by travelers. 329 isolates of DENV-1 were recorded from returning travelers. The importing countries and visited countries were confirmed through checking information in Genbank and corresponding references. There were 30 visited countries/areas and 7 importing countries/areas in total. The inner pairs of the alluvial plots show the subgenotype flow of 329 isolates from the visited (exported) countries/areas (Left) to the imported (Right), and the width of alluvial segments indicates the number of isolates. The outer pairs show the subgenotypes proportions of DENV-1 excluded data from travelers in the involving exported (Left) and importing (Right) countries/areas