EN
The paper presents the data associated with non-specific reactions of sera tested for equine infectious anaemia (EIA). The animals before samples collection suffered from influenza. Out of 502 sera assessed by the double immunodiffusion test 20 reacted positively with EIA antigen developing single non-specific precipitation lines. It was found that the process of incubation, freezing and thawing of the sera brought about a vane of precipitation. These sera possessed a statistically significant increase of proteins of acute phase (seromucus, ceruloplasmine and sialic acids) compared with the control group. No such changes were found by means of haematological examinations.