5. Conclusion
The density and genetic background of the L. tropicavector, P. sergenti , seem to play a pivotal role in the
prevalence of ACL. Between these two localities, endemic and undamaged,
there are differences in both the vector density and its main
mitochondrial lineage that may explain the different epidemiological
situation. Given that the P. sergenti density in Sidi Hajjaj
seems sufficient to allow transmission, the main factor that would
justify the absence of ACL cases could be the absence of P.
sergenti lineage IV, which seems to prefer warmer and drier climates.