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The VP2 variable region of African and German isolates of infectious bursal disease virus: comparison with very virulent, "classical" virulent, and attenuated tissue culture-adapted strains., Zierenberg, K, Nieper H, van den Berg Thierry, Ezeokoli C D., Voss M, and M\'fcller H , Arch Virol, 2000, Volume 145, Issue 1, p.113-25, (2000)\par \par }