The vectors that transmit Borrelia burgdorferi from natural reservoirs to humans are:

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The vectors that transmit Borrelia burgdorferi to humans are ticks, specifically the black-legged tick (Ixodes scapularis) in the eastern U.S. and the western black-legged tick (Ixodes pacificus) in the western U.S. These ticks acquire the bacteria by feeding on infected reservoir hosts such as rodents and birds, and can then transmit the bacteria to humans during subsequent feeding. While both deer and birds may serve as reservoir hosts for the bacteria, they are not direct vectors of transmission to humans.

The Vectors That Transmit Borrelia Burgdorferi from Natural Reservoirs to Humans