“…A study of heterologous C F antibody responses in persons naturally or experimentally infected with ECHO virus types 10, 16, and 20, Coxsackie B virus type 3 , or poliovirus type 1 , indicated an antigenic relationship between the following viruses: ECHO types 2, 4, 5, 6,7,8,11,14,16 R,C 9/10 8 8 A study of heterologous C F antibody responses in persons naturally or experimentally infected with ECHO virus types 10, 16, and 20, Coxsackie B virus type 3 , or poliovirus type 1 , indicated an antigenic relationship between the following viruses: ECHO types 2, 4, 5, 6,7,8,11,14,16 R,C 9/10 8 8 …”