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bor·rel·i·o·sis | \ bə-ˌrel-ē-ˈō-səs 
, -ˌrē-l- \
, -ˌrē-l- \ plural borrelioses\ -ˌsēz \
\Medical Definition of borreliosis
: infection with or disease caused by a spirochete of the genus Borrelia specifically : lyme disease
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