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Perhaps I simply need a reality check, but my gut feeling is that the critters are likely to be there, and certain activities, like messing around with lots of leaf litter, will leave you open a much higher chance of being bitten.
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Leaf litter is quite acid (between 3-5 on the pH scale, depending on specific species of tree). This makes it moderately dangerous for most insects, so most insects avoid these environments. An improvised shelter constructed from leaf litter is, contrary to expectation, remarkably free from insects.
With sensible precautions the ticks can normally be avoided quite easily.
//Kim Horsevad