Figure 2
From: The changing global distribution and prevalence of canine transmissible venereal tumour
Worldwide CTVT distribution and prevalence. (A) CTVT worldwide distribution by country. The colour of each country represents the average of all CTVT prevalence estimates obtained from that country. The location of each response is indicated with a black dot. Countries from which fewer than three responses were received are coloured in grey. Complete datasets are included in Additional file 6 and Additional file 7. Map was created using the maptools and ggmap packages, implemented in R. (B) Average reported CTVT prevalence by continent. The number of responses estimating prevalence in each continent is shown above each bar.