Host-parasite interactions in non-native invasive species are dependent on the levels of standing genetic variation at the immune locus.

"availability of data and materials the results of individual genotyping of mhc-drb locus obtained as a result of genotyping procedure of illumina sequencing files and scanning for intestinal parasites will be deposited in open science framework repository service upon publication. availability of data and materials the results of individual genotyping of mhc-drb locus obtained as a result of genotyping procedure of illumina sequencing files and scanning for intestinal parasites will be deposited in open science framework"

"Competing interests The authors declare that they have no competing interests."

"Funding This work was supported by the grant from the National Science Centre, Poland, project no. 2014/15/B/NZ8/00261 awarded to Aleksandra Biedrzycka. The funding bodies played no role in the design of the study and collection, analysis, and interpretation of data and in writing the manuscript."