Where or when is calfhood vaccination most important?
Owners whose herds are located in areas of relatively heavy infection or who ship replacement cattle or bison to, or receive animals from, such areas should carry out a vigorous calfhood vaccination program. Every cattle or bison owner, regardless of location, should discuss the advantages and disadvantages of vaccination with his or her veterinarian. Some States do not allow cattle and bison to be imported for breeding if they are not official vaccinates and they are beyond the age at which they should have been vaccinated. • Where is vaccination less important? In many areas of the country, low herd infection rates coupled with improvement in the detection of early infection through BRT, MCI, and other surveillance systems have lessened the need to continue calfhood vaccination. Vaccination should be reduced in such areas, provided that adequate regulatory measures are in effect to prevent reintroduction of the disease. • How does brucellosis affect humans? People infected with the b
