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