My own opinion, is that rabies is under diagnosed. A few summers ago, I noticed my husband's hand had two small punctures on his hand. He didn’t even notice them, they were very small, set together, just like identical pin pricks on his hand. Since bats with rabies had been identified in our area, I looked at pictures on the web of "bat bites". They looked like a bite to me.
I took him to the ER, and the doctor agreed with me, and gave my husband the series of shots.
My husband didn't even know he had been bitten. He often sits outside on the deck in the summer, watching the sunset. With a dish of cherries or grapes next to him. And he does doze off...
Well, long story...but if you look at rabies, it causes dememtia...and I wonder how many elderly people may actually have rabies, unidentified...