sentence: Current models of the interaction between the gray squirrel ( Sciurus carolinensis ) , the red squirrel ( Sciurus vulgaris ) , and squirrelpox virus ( SQPV ) , for example , have generally assumed 100 % mortality of red squirrels when exposed , and equal infection intensity between the two species , despite subsequent evidence to the contrary ( Sainsbury et al. 2008 ; Atkin et al. 2010 ; Shuttleworth et al. 2014 ) .