North Dakota's state veterinarian is advising livestock producers to vaccinate their animals against anthrax following recent weather conditions, as the conditions are favorable for the disease to spread. An effective vaccine is available, but it requires a week to build immunity and must be given annually. The state is reminding livestock owners to monitor their herds for unexplained deaths and report them to their veterinarian. Anthrax, caused by the bacteria Bacillus anthracis, has been more frequently reported in northeast, southeast, and southcentral North Dakota.