Paul Bunnel test is done for

(B) EBV # Heterophil antibodies, which is an antibody against EBV cross reacts with red blood cells of different animal species.> This can be used as a rapid screening test for mononucleosis (Monospot test and Paul Bunnell tests)> The Paul-Bunnell test uses sheep erythrocytes; the Monospot test, horse red cells, blood cells.> In infectious mononucleosis, IgM heterophil antibodies are usually detectable for the first 3 months of infection.