Communicable Disease Center report here

Excerpt:
" Bat exposure in the home was the likely source of infection in this case. Over 90% of domestically acquired human rabies cases reported in United States since 1995 have been linked epidemiologically to bats (5). Cryptogenic human rabies (i.e., cases where a definitive history of animal exposure is lacking) constitutes an increasing proportion of these bat-associated cases (6). Rabies virus transmission can occur from seemingly minor or unrecognized bites. A complete rabies virus exposure risk assessment is recommended for any person reporting potential exposure to a bat, even in the absence of a documented bite (1)."

Hard to diagnose, impossible to cure. A particular danger to EMS and ER personnel, because of the body fluid transmission issues. I helped care for a farmer exposed to a rabid cow, once upon a time: Holsteins do not bite, having mandibular dentition only, but they drool a lot, and the saliva can transmit the virus via a skin break.