question, page-6

Maybe the answer from TB blog spot may give you some light on the subject.
"Another source of is puzzlement is why did the researchers from Copenhagen University proceed with their patent for "measuring cell-mediated immune reactivity (CMI) in mammals based on the production of IP-10" when a similar patent already exists, that being for the "method for measuring CMI in a subject" by stimulating "cells of the immune system with an antigen" producing "IFN-y or other cytokine or immune effector molecule" and then detecting and measuring the "presence or level of immune effector".

Perhaps they became distracted;