Rabies is a, dangerous viral disease affecting the brain, which is contracted by the bite of any warm-blooded animal like a dog, monkey, fox etc. and results in definite death. This disease can occur anytime between 30 to 60 days or even after 6 months of animal bite. In the initial stage there are certain behavioral changes and the patient stays excited and then he may suffer from paralysis etc. The mainsymptom is phobia of water and in a short period death occurs either due to respiratory failure or ceasing of the heart beats. Even the best treatment can rarely save a patient. Therefore prevention is very important. It is advisable that rabies vaccine and anti-serum be used in each and every case of animal bite. The older vaccine has some side effects and therefore newly discovered refined vaccines called HDCV (which are a little costlier) are preferable. In such matters it is important to consult a doctor immediately.