Lau et al. (2014) identified a single Major Histocompatibility Complex (MHC) Class II variant (DAβ*10) that was more prevalent in koalas with Chlamydia infection and a second MHC Class II variant (DBβ*04) associated with high Chlamydia‐hsp60 antibody levels. This evidence concerns the gene HLA-C and chlamydia infectious disease.