Experienced cattle breeders know that brucellosis can cause severe losses. The loss of calves is apparent. Not so apparent are losses due to sterility and decreased milk yield. Although important, losses to the livestock industry are not the sole reason we are concerned about brucellosis. There is no doubt as to the existence of a disease in man, commonly known as undulant fever or brucellosis, which is caused by Brucella organisms of animal origin. Scientific evidence indicates that rarely, if ever, does one human contact brucellosis from another human. It appears, therefore, that prevention and control of brucellosis in man is directly dependent upon its control and eradication in domestic animals.

Cattle and swine are tested at slaughter for brucellosis. Suspect animals require additional on farm testing and epidemiology. For years, suspect animals have resulted after administration of Strain 19 vaccine. This has been a problem for cattle producers and animal health officials.

A new vaccine, Strain RB-51, has been developed in an attempt to reduce the number of vaccinated animals testing suspect. Unlike Strain 19, Strain RB-51 doesn't appear to create confusion with brucellosis tests. This will enable states with infected herds to more easily move toward "Free" status.

The Strain RB-51 is now the only approved vaccine for brucellosis. Dairy cattle in Ohio need to be vaccinated between 4 an 6 months of age, while Beef cattle can be vaccinated between 4 and 8 months of age.