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(A) Growth curve of B. burgdorferi strain B31 in vitro. (B) Representative images of the log phase (3-day culture) and stationary phase of B. burgdorferi B31 strain (7-day culture), observed with fluorescent microscopy using the SYBR Green I/PI stain (×400 magnification). The arrows indicate multiple morphological forms of B. burgdorferi in stationary phase.
