Burgdorferi is a genus of bacteria, most famously the species burgdorferi that causes Lyme disease. It is used mainly in scientific and medical contexts to refer to this organism in its natural form or in laboratory settings. The term is a proper noun, named after Willy Burgdorfer, who first identified the bacterium. In pronunciation, it’s a multi-syllabic, non-English loanword with a distinct stress pattern.
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