“…In the present study there were two southeastern European subspecies, A. m. carnica and A. m. macedonica, which both belong to the C2D and C2E mtDNA haplotype (Susnik et al, 2004;Kozmus et al, 2007) of the C Mediterranean lineage (Garnery et al, 1992;Franck et al, 2000;Meixner et al, 2007). Indigenous non-hybridized A. m. carnica populations in the region (Stanimirovic et al, 2005;Sušnik et al, 2004;Kozmus et al, 2007), an important genetic resource for future bee breeding programs (Stanimirovic et al, 2005;De la Rua, 2009), may be more resistant to N. ceranae. Nevertheless, the influence of bee subspecies on their susceptibility could be the subject of further investigation.…”