In 2016, researchers from Mayo Clinic, in collaboration with the CDC and health officials from Minnesota, North Dakota and Wisconsin discovered a new bacterial species (Borrelia mayonii) that causes Lyme disease. Previously, Borrelia burgdorferi was the only bacterium believed to cause Lyme disease. 
In their article, “Lyme carditis–induced sinoatrial dysfunction after initiation of targeted oral antibiotic therapy: A case report,” Chen and colleagues describe a case in which Lyme carditis triggered sinoatrial node dysfunction that manifest more than 1 week after antibiotic treatment. 
The Bartonella pathogen can be carried and transmitted by various animals and insects including fleas, flea feces, cat licks or scratches, ticks, lice, and biting flies. The infection has been associated with new-onset neurologic and psychiatric symptoms.
Rocky Mountain spotted fever (RMSF) is a potentially lethal disease that can be transmitted through the bite of an infected tick. The disease, which can impact various organ systems in the body, typically presents with vague symptoms such as fever, headache, rash, muscle pain, and nausea.
In this study, conducted in Dublin, Ireland, investigators examined the efficacy of combination antibiotic treatment on various types of tick-borne infections.
There have only been a few reported cases of myocarditis occurring in individuals with anaplasmosis. In a recent study, investigators describe a 61-year-old man who was diagnosed with myopericarditis related to anaplasmosis. The patient also tested positive for Lyme disease.
Carditis is a rare complication of Lyme disease and usually occurs several weeks after exposure to a tick bite. Conduction abnormalities are the most common manifestation of Lyme carditis.
Guillain-Barré Syndrome (GBS) is an autoimmune disorder which involves your immune system mistakenly attacking the peripheral nerves outside of the brain and spinal cord. It typically presents with weakness and/or tingling sensations in the legs, which can progress and spread to the arms and upper body.
In their case report “Borrelia burgdorferi—A Bacterium Worthy of Consideration in Culture-Negative Prosthetic Joint Infection,” Crowe and colleagues describe a patient who developed a prosthetic joint infection due to Borrelia burgdorferi. 
Anaplasmosis rarely causes neurologic complications. But the authors of a new study, describe a patient who developed encephalitis due to an infection with Anaplasma phagocytophilum. This is believed to be the first case reported in the literature of Anaplasma encephalitis.