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Rabies is a lethal disease that is transmitted to humans via the saliva of infected animals, most commonly as a result of a bite or scratch. The disease is caused by lyssaviruses, which includes the rabies virus. Globally, dogs are the most likely animals to carry and spread rabies. The disease can only be diagnosed after the onset of symptoms. Initial symptoms resemble that of the flu, while later symptoms may comprise fever, nausea, anxiety, excessive salivation, hallucination, insomnia and paralysis. There is a vaccine and the disease can be treated within the first 10 days, though it almost always results in death after neurological symptoms start.