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Lyme Disease is primarily caused by the bacterium Borrelia, specifically Borrelia burgdorferi. This spirochete is transmitted to humans through the bite of infected black-legged ticks, also known as deer ticks. Understanding the disease's vector and the specific pathogen involved is crucial for proper diagnosis and treatment.

Borrelia's unique helical shape and its ability to evade the immune system contribute to the complexities of Lyme Disease. As a result, identifying Borrelia as the causative agent is essential for understanding the disease's pathophysiology, symptoms, and the rationale behind treatment options such as antibiotics.

The other bacteria listed are associated with different diseases: Clostridium tetani is known for causing tetanus, Streptococcus encompasses a group of bacteria that can lead to various infections, including strep throat, and Escherichia coli primarily causes gastrointestinal illnesses, although certain strains are associated with other clinical manifestations. Each of these bacteria has distinct characteristics and pathogenic mechanisms that differentiate them from Borrelia and the diseases they cause.