Definition
The *genus Borrelia* comprises a group of spiral-shaped bacteria, also known as spirochetes. These bacteria are transmitted to humans and animals through the bites of arthropods like ticks and lice. Many species are pathogenic, causing diseases such as Lyme disease and relapsing fever. *Borrelia* species are characterized by their irregular coiling and unique flagella. Think of them as tiny, coiled adventurers hitchhiking rides on insects.