<prompt> EI Tor vibrio may be differentiated from classical vibrio by fact that EI Tor vibrio-Agglutinate chicken and sheep erythrocytessResistant to classical phage IVResistant to polymyxin B-50 unit discAll of the above  <response>: El Tor vibrios Agglutinate chicken and sheep erythrocytes. Resistant to classical phage IV Resistant to polymixin B-50-unit disc, and The VP reaction and haemolytic test do not give consistent results. Ref:PARK;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition , Page 229 