the official CDC answer is that its only transmitted by ticks. several MD's (who are probably more on the alternative side), have claimed they have seen transmission from mother to foetus, husband to wife (sexually), blood transfusions, fleas and mosquitoes.... there are a lot of wild claims. there may even be some pubmed references with alternative transmission routes discussed...
i don't know what to think. like i said earlier, some alternative MDs are stating that we're in the middle of a lyme disease epidemic and that chronic fatigue, fibromyalgia, lupus, ALS, MS, Alzheimers etc. is really just misdiagnosed Lyme disease.
i think that's a bit much... but what do i know? i wouldn't bother worrying about lyme disease unless you live in an endemic area and are out in the woods a lot.
the salt/c protocol, however, seems to work on a variety of bugs. am having quite the effects on it already - and will post more about it if the effects keep up.