Answer to Question 1
Answer: Encephalitis is an infection that invades the entire brain. A common cause of encephalitis is a virus transmitted by mosquitos, which in turn receive it from horses, birds, or rodents.
Answer to Question 2
Answer: Prions are protein infectious agents. Prions are three-dimensional proteins that when misfolded can accumulate in a neuron leading to toxicity and death of the cell. Prions cannot be destroyed with heat, and can transmitted to others (transplantation of infected prion tissue).
