oh_sigh is correct, humans are a dead end host for lyme. It's primarily maintained in a mouse reservoir - the larval and nymph ticks feed on infected mice, and then the nymph and adult ticks can expose humans and deer. Deer are not really a big reservoir either, since mostly adult ticks feed on them, but they do move ticks around.

Edit: you can actually try to vaccinate the reservoir, however: https://www.ncbi.nlm.nih.gov/pubmed/24523510