Malaysian scientists are testing a vaccine that spreads by itself as a solution to haemorrhagic septicaemia, a highly infectious buffalo and cattle disease that costs millions of dollars a year, SciDev.Net reported in September 2010. Haemorrhagic septicaemia is hard to vaccinate against where livestock roam freely, because animals are difficult to capture and restrain long enough for an injection. 
Scientists have now developed a live vaccine - a disabled form of the bacterium that triggers an immune response without causing the disease. Researchers spray the vaccine up an animal's nose and they breathe it out, where it remains airborne and is inhaled by animals within two metres of them. Haemorrhagic septicaemia is a fatal bacterial disease found in buffalo and cattle in many African, Asian and Middle Eastern countries. 

(SciDev.Net)