KIT and tuberculosis: This is likely because KIT and LAB perform best in a population with a high frequency of Aa and Qa blood types (and lower frequency of anti‐Aa or anti‐Qa antibodies), such as TB horses (100% Aa positive and 86% Qa positive in 7 tested horses (Supplemental Table S1).12 The frequency of blood types in WB has not been published, but 78% of the 9 tested WB in Aim 1 were Aa positive and 11% were Qa positive (Supplemental Table S1).