Borrelia hermsii

Borrelia hermsii is a species of spirochete bacteria that is known to cause tick-borne relapsing fever (TBRF) in humans. It is named after its discoverer, Dr. Willy Herms, who first identified the bacterium in the early 20th century.

Taxonomy

Borrelia is a genus of bacteria in the Spirochaetes phylum. The genus contains over 20 recognized species, including Borrelia hermsii. The species is further classified into two genomic groups, I and II, based on genetic differences.

Morphology

Borrelia hermsii is a spirochete, meaning it has a spiral-shaped structure. It is a Gram-negative, aerobic bacterium with a flexible, helical body that allows it to move in a corkscrew-like manner.

Life Cycle

The life cycle of Borrelia hermsii involves two hosts: a mammalian host, such as a human, and a tick vector, specifically the Ornithodoros hermsi tick. The bacterium is transmitted to humans through the bite of an infected tick.

Pathogenesis

Once inside the human host, Borrelia hermsii can cause tick-borne relapsing fever. The bacterium evades the host's immune system by periodically changing its surface proteins in a process known as antigenic variation. This allows the bacterium to cause recurrent episodes of fever and other symptoms.

Diagnosis and Treatment

Diagnosis of Borrelia hermsii infection is typically based on clinical symptoms and confirmed by laboratory tests, such as polymerase chain reaction (PCR) or serology. Treatment usually involves antibiotics, such as doxycycline or penicillin.

Prevention

Prevention of Borrelia hermsii infection primarily involves avoiding exposure to ticks in endemic areas. This can be achieved through the use of insect repellents, wearing protective clothing, and checking for ticks after outdoor activities.

See Also

• Borrelia burgdorferi
• Lyme disease
• Relapsing fever