Vaccination of Claves With Modified Live Infectious Bovine Rhinotracheitis IBR Virus Vaccines
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Date
1973
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The topic is the vaccination of calves with modified live infectious bovine rhinotracheitis IBR virus vaccines. Extensive use of modified-live IBR virus vaccines has resulted from the omnipresence of the disease syndrome associated with IBR virus. The relative value of this vaccine in providing protection
has been the subject of recent investigations and considerable controversy. A study to test this is discussed. All calves in this investigation that were vaccinated
twice had titers of two or higher. The second
vaccination did not effectively increase the serum
titer in some animals; the titers of 10 calves were reduced and titers of six calves remained unchanged, while the titers of only six calves increased after the second vaccination.