Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. One of the most dangerous viral diseases is caused by the rabies virus. Rabies is a viral disease that infects the central nervous system, causing acute inflammation of the brain, or encephalitis. It is transmissible from animals to humans, most commonly from a bite of an infected subject. For a human, rabies is almost always fatal if post exposure prophylaxis is not administered prior to the onset of severe symptoms. Learn more about rabies, its life-cycle and transmission, as well as symptoms, cures and vaccines of the deadly disease it causes in the following pages.