Babesiosis is an infectious disease caused by protozoa of the genus <i>Babesia</i> and characterized by a febrile illness and hemolytic anemia but with manifestations ranging from an asymptomatic infection to a fulminating illness that can result in death.

Any cardiac rhythm other than the normal sinus rhythm. Such a rhythm may be either of sinus or ectopic origin and either regular or irregular. An arrhythmia may be due to a disturbance in impulse formation or conduction or both.