Tick Bite Leads to Multiple Co-Infections

Tick bite coinfections are more common than many realize. A single tick can transmit multiple pathogens simultaneously, leading to complex illness that may be difficult to diagnose and treat.

This case report illustrates how one patient developed three separate tick-borne infections after a single tick bite.

“Two days after noting this ankle lesion, the patient noticed an erythematous rash on his neck and chest,”
the authors explain.
He was prescribed an antihistamine and a 7-day course of trimethoprim–sulfamethoxazole.

The rash resolved after five days of treatment, but the patient continued to experience pain and swelling in his ankle. The pain eventually spread to his left hip and he was “diagnosed with sciatica and prescribed gabapentin.”

The patient had reportedly traveled to an endemic region of the United States and was therefore suspected of having a tick-borne illness.

Why Tick Bite Coinfections Are Often Missed

“Physicians must maintain a high level of suspicion for
tick-borne coinfections,
as untreated disease can result in long-term and sometimes life-threatening sequelae,” the authors suggest.

Laboratory testing later confirmed infection with
Borrelia burgdorferi,
Anaplasma phagocytophilum,
and
Babesia microti.

Although the patient improved with treatment, one year later he continued to experience neuropathy at the site of the presumed tick bite.

This case highlights the importance of evaluating patients for multiple tick-borne infections whenever illness follows a tick exposure in an endemic region.

Clinical Takeaway

A single tick bite can transmit multiple pathogens simultaneously—including Lyme disease, Anaplasmosis, and Babesia—creating complex diagnostic and treatment challenges.

• Patients with persistent symptoms after initial antibiotic treatment may harbor undiagnosed coinfections. This patient continued to have pain and neuropathy one year later.
• Single-pathogen treatment approaches may fail when multiple infections are present. Resolution of a rash does not confirm treatment of all pathogens.
• Misdiagnosis is common when symptoms do not match classic presentations. This patient was initially diagnosed with sciatica and treated with gabapentin.
• Comprehensive testing for coinfections should be considered when tick-borne illness is suspected in endemic regions.

Frequently Asked Questions

Can one tick bite transmit multiple infections?

Yes. A single tick can carry and transmit multiple pathogens including Lyme disease (Borrelia burgdorferi), Anaplasmosis (Anaplasma phagocytophilum), and Babesia (Babesia microti).

Why do symptoms persist after antibiotic treatment?

Persistent symptoms may reflect undiagnosed coinfections requiring different treatments. In this case, neuropathy persisted even after initial therapy.

How are tick-borne coinfections diagnosed?

Comprehensive testing for multiple pathogens should be considered when tick-borne illness is suspected. This may include testing for Lyme disease, Anaplasmosis, Babesia, and other regional infections.

What should I do if symptoms don’t improve after treatment?

Patients with persistent symptoms should discuss the possibility of coinfections with their clinician, particularly if exposure occurred in a tick-endemic region.

For comprehensive Babesia information organized by topic—including symptoms, testing, treatment, blood transfusion risks, and special populations—visit our
complete Babesia guide.

Related Reading

• Lyme Disease Co-Infections: Symptoms, Testing, and Treatment
• Babesia and Lyme: What Patients Need to Know
• When Lyme Treatment Fails: Could It Be Babesia?

References

1. Grant L, Mohamedy I, Loertscher L.
   
   One man, three tick-borne illnesses
   .
   BMJ Case Rep. 2021;14(4):e241004.