Babesiosis

Babesiosis is an infection caused by microscopic parasites that invade and destroy red blood cells. These parasites are typically transmitted through tick bites, though other routes of transmission can occur. The destruction of red blood cells can lead to anaemia and a cascade of effects throughout the body. Owners often first notice that their dog seems unusually tired, off food, or has developed pale gums. In some cases, urine may appear darker than usual, ranging from orange to brown. Fever may be present, though signs can vary considerably depending on which Babesia species is involved, how quickly the infection has progressed, and the individual animal's response. Cats are affected much less commonly than dogs in the UK. This page explores the patterns that may raise concern for babesiosis, what is happening at a cellular level when the parasite takes hold, how the condition is investigated through blood tests and other means, and the approaches used to address both the infection and its effects on the body.