Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Lemierre syndrome ?
    ### Response:
    Lemierre syndrome is a rare and potentially life-threatening illness. The bacterium responsible for this disease is typically Fusobacterium necrophorum, although a wide variety of bacteria have been reported as causing the disease.  The bacterial infection begins in the oropharynx then spreads through the lymphatic vessels.
    