Do animals that receive adult vaccination (brucellosis vaccine booster) test brucellosis positive?
Animals vaccinated until 1996 received Strain 19 brucellosis vaccine. Diagnostic tests could not differentiate between an infected and vaccinated animal. This was particularly true if an animal was vaccinated more than once. Since 1996, a new vaccine called RB51 came into widespread use. Animals vaccinated with RB51 do not test positive on diagnostic tests. Even animals vaccinated several times with RB51 will remain negative on blood tests.
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