An immunohematologic complication of isoniazid

The characteristics of an immunohematologic reaction to isoniazid are described with emphasis on the mechanism of development of the positive antiglobulin test. In contrast to previous findings, the antibody is a firmly bound IgG complement-binding antibody, reacting best at 37 degrees C by antiglobulin techniques and only with isoniazid presensitized cells. A method for preparing isoniazid-sensitized cells is described.