In general, infection with H. felis resulted in a decreased diversity index (statistically significant for WT at 6 months (p < 0.05); Myd88−/− at 1 month (p < 0.05) and 3 months (p < 0.01); TrifLps2 at 3 months (p < 0.05); and DKO at 3 months (p < 0.01). Here, MYD88 is linked to infection.