Test viruses H. Atiter EID50 u/ml MD Thours ICPI IVPI Thermostability of Haemagglutinins Rate of Elution Agglutination of mammalian RBC PFU in CEF (PFU/ml) Field virus isolate 64 107.14 46 1.74 2.01 inactivated at 60°C within 15 minutes rapideluter Agglutinates mammalian RBC except equine RBC 5.39×106 BOM-Iisolate 512 108.3 38 1.8 2.63 inactivated at 60°C within 30 minutes rapideluter Agglutinates mammalian RBC except equine RBC 6.35×106

Table 1: Showing the comparison of the biological characteristics of field virus isolate and BOM-I isolate.