Influenza A virus (A/Duck/Czechoslovakia/56(H4N6));
Influenza A virus (A/duck/Czech Republic/1/1956(H4N6));
Influenza A virus (A/duck/Czech Republic/1956(H4N6));
Influenza A virus (A/duck/Czech/1956(H4N6));
Influenza A virus (A/duck/Czechoslovakia//1956(H4N6));
Influenza A virus (A/duck/Czechoslovakia/56 (H4N6));
Influenza A virus (A/duck/Czeckoslovakia/1956(N4N6));
Influenza A virus (STRAIN A/DUCK/CZECHOSLOVAKIA/56)