Chinese scientists have begun researchers to develop a unique vaccine for the deadly human immuno deficiency virus (HIV) based on the research of an effective antidote to a fatal horse disease similar to AIDS. Scientists from China's top AIDS research body - the AIDS reference lab of China's Academy of Preventive Medicine - and the Harbin Veterinary Institute of the Chinese Academy of Agricultural Sciences (CAAS) have reached an agreement to jointly launch the research programme, official reports here said.