coronavirus presents little variability, approximately seven mutations per sample.Common influenza has a variability rate that is more than double, the researchers said."The SARS-CoV-2 coronavirus is presumably already optimised to affect human beings, and this explains its low evolutionary change," said Federico Giorgi, a researcher at University of Bologna, and coordinator of the study."This means that the treatments we are developing, including a vaccine, might be effective against all the virus strains," Giorgi said.The researchers noted that currently there are six strains of the novel coronavirus.The original one is the L strain, that appeared in Wuhan in December 2019.