The avirulent strain, CMM100, does not contain these plasmids.
2.
Such transfers create virulent strains from previously avirulent strains.
3.
Passive immunity may protect against challenge with homologous IBDV, as does previous infection with homologous avirulent strains.
4.
The virulent and avirulent strains produced the same amount of ectopolysaccharides, suggesting that EPS does not play a significant role in pathogenicity.
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