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Tick Bite Fever: Causes, Symptoms & Treatment

Tick bite fever refers to a febrile illness following a tick bite, caused by pathogens transmitted during feeding. Early diagnosis and treatment are essential for recovery.

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Things worth knowing about "Tick bite fever"

Tick bite fever refers to a febrile illness following a tick bite, caused by pathogens transmitted during feeding. Early diagnosis and treatment are essential for recovery.

What is Tick Bite Fever?

Tick bite fever describes a feverish illness that can develop after being bitten by a tick. Ticks are small arachnids that can transmit a variety of pathogens – including bacteria, viruses, and parasites – while feeding on a host. Fever is one of the most common warning signs that the immune system is responding to an infection introduced by a tick bite.

Causes and Transmitted Pathogens

Not every tick bite leads to infection or fever. The most common diseases associated with fever after a tick bite include:

Lyme disease (caused by Borrelia burgdorferi): The most common tick-borne illness in Europe and North America. Fever often appears alongside a characteristic expanding skin rash called erythema migrans.
Tick-borne encephalitis (TBE): A viral infection that can affect the central nervous system. After an initial fever phase, a second, more severe phase involving meningitis or encephalitis may follow.
Anaplasmosis and Ehrlichiosis: Bacterial infections causing high fever, headaches, and muscle pain.
Babesiosis: A parasitic disease targeting red blood cells, causing fever, chills, and fatigue.
Rickettsiosis: Infections caused by Rickettsia bacteria, presenting with high fever, rash, and body aches.

Symptoms

Symptoms can vary depending on the causative pathogen. Common signs that may indicate an infection following a tick bite include:

Fever (often above 38.5 °C / 101.3 °F)
Chills and sweating
Headache and muscle aches
Fatigue and general malaise
Skin changes such as a reddish expanding ring around the bite site (erythema migrans in Lyme disease)
Joint pain and inflammation
Neurological symptoms in severe cases (e.g., in TBE)

When to See a Doctor

After a tick bite, the bite site should be monitored daily. Medical attention is strongly recommended if:

Fever develops within 1–4 weeks after the tick bite
A ring-shaped rash appears around the bite site
Headaches, neck stiffness, or neurological symptoms occur
Persistent fatigue or joint problems develop

Diagnosis

Diagnosis is based on a combination of clinical examination and laboratory testing. The physician will assess the history of tick exposure and evaluate symptoms. Common diagnostic steps include:

Complete blood count (CBC): To detect signs of inflammation or abnormal blood values
Serology: Detection of antibodies against specific pathogens (e.g., Borrelia antibodies)
PCR testing: Direct detection of the pathogen in the blood
Cerebrospinal fluid analysis: If TBE or neuro-Lyme disease is suspected

Treatment

Treatment depends on the identified or suspected pathogen:

Lyme disease: Antibiotic therapy, usually with doxycycline or amoxicillin for 10–21 days
TBE: No specific antiviral therapy available; treatment is supportive; prevention through vaccination is strongly recommended in endemic areas
Anaplasmosis / Ehrlichiosis: Antibiotic therapy with doxycycline
Babesiosis: Combination of antiparasitic agents (e.g., atovaquone and azithromycin)
Rickettsiosis: Doxycycline is the treatment of choice

Supportive measures such as rest, adequate fluid intake, and fever-reducing medications like paracetamol (acetaminophen) can help support recovery.

Prevention

The best protection against tick bite fever is preventing tick bites in the first place:

Wear long-sleeved clothing and long trousers in wooded or grassy areas
Use insect repellents containing DEET or icaridin
Thoroughly check the body for ticks after outdoor activities
Remove ticks as quickly as possible using fine-tipped tweezers, without crushing them
Get vaccinated against TBE if living in or travelling to endemic regions

References

Robert Koch Institute (RKI): Tick-borne diseases – Epidemiological Bulletin. Berlin, 2023. Available at: www.rki.de
Stanek G. et al.: Lyme borreliosis. Lancet. 2012;379(9814):461–473. doi:10.1016/S0140-6736(11)60103-7
World Health Organization (WHO): Vector-borne diseases – Tick-borne diseases. Available at: www.who.int

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