The patent for LYMErix has expired [1] and the vaccine is still considered to be safe and effective by the FDA [2]. Someone want to start producing it again?
[1] http://patft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=...
[1] http://patft1.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=...
I wonder if a Federal law in the USA could prevent lawsuits for specific vaccines.
[EDIT: Actually this may not be correct (in this case) because LymeRix was a voluntary vaccination.]
Vaccinations like the one for Lyme being made unavailable isn't a decision based on liability or risk so much as low demand.
The focus is on compulsory childhood vaccines although the government can add others at its discretion.