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Lyme disease is a tick-borne illness caused by bacteria of the Borrelia type. It is most commonly transmitted to humans through the bite of infected blacklegged ticks, also known as deer ticks. In the United States, the primary species responsible is Ixodes scapularis, while in Europe, Ixodes ricinus is the main vector. Symptoms can vary widely and may develop in stages. Early localized Lyme disease, occurring days to weeks after a tick bite, often includes a characteristic expanding red rash called erythema migrans. This rash may resemble a bull's-eye. Other early symptoms can include fever, chills, headache, fatigue, and muscle and joint aches.
If left untreated, Lyme disease can progress to more severe stages. Early disseminated Lyme disease, occurring