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In one agrarian combine an immunoprophylatic program against Haemophilus somnus infections, including a passive protection of newborn calves with an allogenic antiserum (Somnuserum) and active immunization of calves at the age of 4 and 6 weeks with a live vaccine (Soronuvac) was accustomed. The two biopreparates have been obtained by the authors. Losses of calves from 5 Oct. 1984 to 30 July 1985 in...
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