FIG 2.

Distribution of H1N1pdm viruses detected in pigs in France from November 2009 to 2017. The map was colored in an orange gradient according to the size of the pig population in each administrative department, based on data provided by the National Agricultural Census (56). The first mammalian animal H1N1pdm strain isolated in France, i.e., the cat strain, is indicated by a black star. Each circle represents an H1N1pdm virus strain detected in swine. Blue circles are isolates belonging to the seasonal-like (SeL) group, red circles are isolates belonging to the swine divergent (SwD) group, black circles are isolates belonging to neither the SeL group nor the SwD group, and white circles are isolates that were not sequenced. The SeL and SwD genogroups were defined in this study. The map was drawn using R 3.4.0 software (https://CRAN.R-project.org/package=maps).