A simple, sensitive and reproducible fluorometry method was developed to quantify anti-erythrocytic auto-antibody in the sera of semi-immune mice. The level of anti-erythrocytic auto-antibody measured using fluorometry was significantly higher in sera of Plasmodium berghei ANKA infected mice than the uninfected, p&lt
0.0001. This result correlates significantly with the standard ELISA assay, p&lt
0.0001, r2=0.7766. Both methods show significant correlation with regard to extent of Hb loss, p&lt
0.006 (r2=0.33) (fluorometry method) and p&lt
0.0001, r2=0.30 (ELISA). Thus the fluorometry method may serve as an alternative to standard ELISA assay and can be modified to suit similar objectives. © 2010 by The Japanese Society of Tropical Medicine.