i would like to add few points in aggrement with dr bagoria,mountoux test is also a type of injection,the technique k/a subcutaneous ,you will find it mosly used for insulin therapy
another point of interest is that mountoux test is particularly the antibodies
obtained from mycobacter which causes antigen formation,it is similar to natural exposure of this bacteria only difference is that bacterial proient used for this purpose is ivirulent i.e they are non toxic ,so no harm produced.
another point of interest is that this test is not very relaible and not used in revised tuberculosis
programmes,neil zeilson stain test is conformatory.