If reactors are found the herd of origin is tested by individual blood testing. If the Milk Ring Test is positive he takes blood samples of all your animals for laboratory testing. On the other hand, successful eradication of the disease has been carried out in several countries by detection and slaughter of infected animals, followed by proper disinfection of premises and succeeding testing of remaining animals in the herd. It must be kept in mind that even though animals that have aborted once normally calve at term in the following calvings these animals keep on secreting bacteria from the uterus and genital organs after calving and frequently continuously in the milk. This means that other animals in the herd will be infected sooner or later, if the carriers are not slaughtered.
Prevention is possible by vaccination of female calves.
This gives a high grade of protection although some animals may be infected if they are heavily exposed to Brucellosis bacteria. Vaccination on a national scale has been practised with a high degree of success, provided the aim is a reasonable level of control with the disease. Complete eradication in a region or a country, needs slaughter of infected animals and continuous screening, possibly combined with vaccination of calves. The slaughter policy has been applied with success in some European countries. In Asia, vaccination is often obligatory, and slaughter of infected animals recommended to farmers.