Relating to spirochetes, especially to infection with such organisms.
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spi·ro·chet·al or chiefly Brit spi·ro·chaet·al .spī-rə-'kēt-əl adj relating to or caused by spirochetes <\spirochetal infection>
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spi·ro·che·tal (spi″ro-keґtəl) pertaining to or caused by spirochetes.Medical dictionary. 2011.