| http://www.w3.org/ns/prov#value | - Yet another vaccine that is useful in this method is a vaccine which comprises a suitable carrier and an effective immunizing amount of a recombinant IBR virus comprising viral DNA from a naturally-occurring IBR virus in which DNA encoding gpE glycoprotein has been altered or deleted so that upon replication the recombinant IBR virus produces no gpE glycoprotein.
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