[Acquired B antigen: a new case].
A 86 year old woman, in good health but "Escherichia coli" urinary infection, was found to have an abnormality in blood group determination. 3 years ago, blood group of this patient was group A and now, precise determination shows the existence of an acquired B antigen. Disappearance of this acquired B Ag was obtained in 3 months after the urinary infection's treatment. The most cases of acquired B Ag result from neoplasic diseases or infection with enterobacteriacea. Physiopathology of acquired B Ag is secondary to the action of a deacetylase enzyme produced by enterobacteriacea, on group A1 erythrocytes.
D000017:ABO Blood-Group System / Q000276:immunology*; D000368:Aged; D000581:Amidohydrolases / Q000097:blood; D001788:Blood Grouping and Crossmatching; D004927:Escherichia coli Infections / Q000097:blood*; D005260:Female; D006801:Humans; D007519:Isoantigens / Q000032:analysis*; D014552:Urinary Tract Infections / Q000097:blood
D000017:ABO Blood-Group System; D007519:Isoantigens; D000581:Amidohydrolases
Antigène B acquis: une nouvelle observation.