INTERNATIONAL STANDARDS FOR ANTI-POLIOVIRUS SERA TYPES 1, 2 AND 3.

Anti-poliovirus sera types 1, 2 and 3 were examined in an international collaborative study to test their suitability as international standards. It was concluded that the sera are suitable for the purpose, and they are accordingly established as International Standards for Anti-Poliovirus Sera, Types 1, 2 and 3, replacing the existing International Reference Preparations for the same sera, established in 1958.The unitage was defined as follows:For Type 1 preparation: 1 unit is 10.78 mg.For Type 2 preparation: 1 unit is 10.46 mg.For Type 3 preparation: 1 unit is 10.48 mg.