PMC6745544_01
Facial appearance of the patient
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A neurological examination revealed that he had severe growth and psychomotor retardation (Fig. 1).
A) ABO and Rh blood group typing. B) Agglutination with strength of 4+ in all cross-matching with erythrocytes of A1, A2, B, and O blood group and anti-H lectin was negative
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ABO and Rh typing (Fig. 2A). A transfusion of one unit of packed red blood cells was planned, but severe haemolytic reactions developed during a cross-match related to all of the erythrocyte suspensions. The blood group was finally interpreted as the Bombay blood group with naturally occurring anti-H antibodies in the plasma (Fig. 2B).
Expression of CD11a, 11b, 11c, and CD15 by flow cytometry
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The expression of LFA-1 (CD11a/CD18), Mac-1 (CD11b/CD18), and p150/95 (CD11c/CD18) was not absent (Fig. 3).