Serological response of cattle in Kenya vaccinated with a killed B abortus strain 45/20 adjuvant vaccine

The non agglutinogenic character of the 45/20 vaccine has been evaluated under Kenyan conditions in East African Boran and Jersey cattle. Observations are also recorded on the use of the vaccine in cattle with a prior history of strain 19 vaccination and in an infected herd. The problem of persistant reactors is discussed.