• Michigan's Five Most Common Ticks Ticks are significant vectors (carriers) of pathogens that cause human and animal disease. In Michigan, tick-borne diseases are rare, but they do occur and can be serious if not properly diagnosed and treated.
• Description Lyme disease is an illness caused by a spirochete bacterium (Borrelia
burgdorferi). This disease is transmitted to people and animals primarily by
the bite of the tick, Ixodes scapularis.
• The vector: Black-legged ticks. Black-legged ticks (Ixodes scapularis) are responsible for transmitting Lyme disease bacteria to humans in the northeastern and north-central United States.