TLR2, TLR3, TLR9, and TLR13 expression patterns showed no significant variations in mRNA expression in koala PBMCs with a range of subtype infection profiles (KoRV-A only vs. KoRV-A with KoRV-B and/or -C) (Figure 2A,B,H,J). Here, TLR3 is linked to infection.