Fig. 2

Serological investigation of ceftriaxon-dependent antibody using gel card technique (BioRad, Cressier sur Morat, Switzerland). Results showing strong agglutination (4+) of the patient’s plasma and eluate in the presence of the drug, but negative results without ceftriaxone added. Patient’s eluate (1) or plasma (2), ceftriaxone and untreated RBCs; Negative controls: patient’s elutate (1a) or plasma (2a), saline (instead of ceftriaxone) and untreated RBCs