Blacklegged ticks carry multiple bacteria, viruses and parasites that can be transmitted individually or along with Lyme Disease bacteria. It is not unusual to get more than one infection from a single tick bite.
Potential infections include babesioais, anaplasmosis, ehlichiosis, bartonellosis, and others. Some of these diseases do not respond to the antibiotics commonly used to treat Lyme disease. Each infection must be appropriately treated in order for a person to get well.