Two of them. I was also surprised given the large number of brown bats that were diagnosed as infected where I lived. It took us reading the CDC website for 4

Two of them. I was also surprised given the large number of brown bats that were diagnosed as infected where I lived. It took us reading the CDC website for 40 minutes because most of the documentation talked about the "what" and not the "why". After some digging we found it. This was around 2008 in northern California.