Shannon entropy differences between 2010–2015 and 2016–2019 epidemic waves for mumps virus (MuV) SH sequence alignments. The MuV SH sequences belonging to the 2010–2015 epidemic waves were used as background (blue) and were represented at the positive y-axis, whereas sequences belonging to 2016–2019 were used as query (orange) and were represented at the negative y-axis.