Summary Vaccination against braxy has been practised increasingly in Iceland since 1897. Dried cultures prepared by the Danish Serum Laboratory and our antiserum have been most used, on the whole with good results. Since 1929 a new kind of vaccine, consisting of slightly formolised whole cultures, has been introduced by our laboratory and has given constantly better results than the Danish vaccine as shown by the vaccination reports. Although the vaccine contains a number of living spores the reactions are very slight and losses from vaccination negligible.