Unexpected hazard?

I encountered this along the path where I run some mornings:


This wasn't the first time:


A little Googling turns up a report that rabid bats are not rare in San Francisco. But the same report suggests that there's not much to worried about.

In the past three years, 12 percent of the 133 bats tested for rabies in San Francisco have come up positive. Infection among people and pets is rare. The last reported case of dog or cat rabies in San Francisco was more than 60 years ago. The last case of human rabies was in 1987, but the exposure happened outside the United States.

One more thing to be cautious about, but not something worth being inhibited by.