That's actually a really good question, although the answer is controversial.
There is great debate about whether any/all of these diseases are communicable, especially Lyme (because of its prevalence.) Anecdotally, there are many doctors who argue that they are based on their own patients, and there have been a few medical studies that have also shown that they are, but the status quo maintains that they are not. Even though syphilis (which is caused by a very similar, but less insidious, spirochete like the one that causes Lyme) is obviously sexually transmitted, the insurers and their cronies say it's impossible. There is a woman in the documentary I mention that battles with that issue (and miscarriages) and you can also find information online. In my case, my wife had no symptoms, we had her tested for some of the scariest bugs, and we took some other precautions.
I hate to ask this, but as an infectious disease that could be spread by a tick bite, isn't it potentially communicable?