[cyn]

Here’s a partial answer:

http://www.dogbitelaw.com/PAGES/statistics.html

The number of fatalities: In 2007, there were 33 fatal dog maulings in the USA.

Goes on to provide more numbers & links; not yet come across nos for pit bulls only.

[cyn]

http://www.dogbitelaw.com/breeds-causing-DBRFs.pdf >> Table 1 breaks down dog breeds; acc to it, pit bulls were responsible for 66 deaths from 1979 to 1999 (mixed breed pit types added another 10+).

I’m looking for similar information about python or reptile-related deaths in US. I’m sure it must exist, but am not finding it from a reliable source yet.