Successful transfusion of Chido-positive blood to two patients with anti-Chido.

Two cases are described in this report in which patients with anti-Chido in the serum were transfused with Chido-positive blood. Since there was evidence of normal survival of the transfused red blood cells, these findings do not support a suggestion that patients with anti-Chido may require transfusion with Chido-negative blood. In spite of the apparently normal survival of the Chido-positive blood, a previous report in which it was shown that weakly Chido-positive blood can stimulate the production of anti-Chido was confirmed.