What Are Brazilian Ticks? Lyme-Like Disease in Brazil

Brazilian ticks may carry Lyme-like risks
Baggio-Yoshinari syndrome can resemble Lyme disease
Bullseye rashes and neurologic symptoms may be missed

What are Brazilian ticks, and can they cause Lyme-like illness? Brazilian ticks—including species in the Amblyomma and Rhipicephalus genera—have been linked to a condition called Baggio-Yoshinari syndrome, sometimes referred to as Brazilian Lyme-like syndrome.

Many people searching for Brazilian ticks are asking whether ticks in Brazil can cause bullseye rashes, neurologic symptoms, arthritis, or Lyme disease–like illness. Researchers have described important similarities, but there are also differences in tick species, bacterial behavior, and clinical presentation.

The existence of Borrelia burgdorferi s.s. in Brazil was confirmed by polymerase chain reaction testing, according to Miziara and colleagues in the journal Clinics (Sao Paulo). The Amblyomma and Rhipicephalus genera of ticks have been discussed as possible vectors in Brazil. In the United States, Borrelia burgdorferi s.s. is typically transmitted by Ixodes scapularis, while in Europe it is transmitted by the Ixodes ricinus complex.

Are There Ticks in Brazil?

Yes. Brazil has multiple tick species capable of biting humans. Ticks in the Amblyomma and Rhipicephalus genera have received attention because of their possible role in Lyme-like illness and other tick-borne diseases.

What Are Brazilian Ticks?

Brazilian ticks include several hard tick species, including ticks in the Amblyomma and Rhipicephalus genera. These ticks differ from the classic Ixodes ticks most often associated with Lyme disease in the United States and Europe.

This difference may help explain why Lyme-like illness in Brazil can be difficult to classify. Patients may develop symptoms resembling Lyme disease, but the tick species, bacterial forms, and clinical presentation may differ from classic Lyme borreliosis.

Lyme-Like Disease in Brazil

While there are differences between classic Lyme disease and Baggio-Yoshinari syndrome, the two conditions share similarities. Patients with Brazilian Lyme-like syndrome have been reported to experience skin, neurologic, eye, joint, cardiac, and systemic symptoms.

Clinical Manifestations

• An erythema migrans, or bullseye rash, has been reported at the tick bite site in approximately 50% of cases.
• The main neurologic presentations include meningitis, cranial neuritis, and peripheral neuropathy. These findings overlap with broader patterns seen in neurologic Lyme disease.
• Psychiatric complaints have been described in approximately 20% of patients.
• Eye problems may include diplopia, eyelid ptosis, optic nerve damage, papilledema, uveitis, and chorioretinitis.
• Some patients may develop encephalitis, either alone or associated with meningitis.
• Arthritis of large joints, especially the knee, has been reported in 30%–35% of cases.
• Cardiac involvement may include varying degrees of atrioventricular block, although pacemaker placement is generally unnecessary.

Bullseye Tick Bite Rash in Brazil

Searches for “tick bite bullseye” and “bullseye tick bite” often reflect concern about Lyme disease. In Brazil, a bullseye-like rash may also be reported in patients with Brazilian Lyme-like syndrome.

However, not every tick bite produces a bullseye rash, and not every rash confirms Lyme disease. A careful clinical history, exposure history, symptom pattern, and medical evaluation remain important.

Microbiologic Findings

• Multiple forms of Borrelia burgdorferi s.s. have been identified in culture.
• Under adverse conditions such as changes in pH, temperature, or antibiotic exposure, Borrelia bacteria may develop altered forms.
• Blood analysis in patients with Brazilian Lyme-like syndrome has revealed non-motile structures similar to cystic forms reported in spirochetes.
• PCR testing has identified B. burgdorferi in skin or blood samples of some patients months or years after disease onset, even after antibiotic treatment.
• Researchers have discussed possible neuro-immune-endocrine activation triggered by hidden Borrelia or spirochetal outer membrane surface proteins.

Diagnostic Issues

Diagnosis can be difficult, especially when an erythema migrans rash is absent. Many cases are diagnosed on an epidemiological and clinical basis after exclusion of other illnesses. This challenge is similar to broader patterns seen in Lyme disease misdiagnosis.

Serologic testing may be helpful, but blood tests alone do not establish a diagnosis of Brazilian Lyme-like syndrome. Symptoms can mimic other conditions, including chronic fatigue syndrome, autoimmune diseases, and other inflammatory disorders.

• Fatigue may persist longer than 6 months and may not improve with rest.
• Patients may report myalgia, arthralgia, lymphadenopathy, neurocognitive symptoms, headache, sore throat, and sleep disturbance.
• Symptoms may wax and wane or recur over time.

The authors questioned how often patients treated as having idiopathic chronic fatigue syndrome or autoimmune disease may actually represent undiagnosed cases of Borrelia burgdorferi infection.

Treatment Approach

• Patients in the acute stage of Brazilian Lyme-like syndrome with a localized erythema migrans rash and no evidence of dissemination are generally treated with antibiotics for a short period of time.
• Early treatment is recommended. A delay longer than 3 months after symptom onset has been associated with greater difficulty in some patients.
• Longer treatment may be necessary when dissemination is suspected.
• Delayed diagnosis may lead to serious manifestations, including neuroborreliosis, encephalomyelitis, ataxia, and erosive arthritis.
• Patients with neuroborreliosis have been treated with intravenous antibiotics such as ceftriaxone or penicillin G sodium, followed by additional oral therapy in some cases.

Autoimmune Concerns

The authors discuss the possibility that Borrelia burgdorferi infection may trigger an autoimmune response in some patients. This is clinically important because autoimmune-like symptoms may complicate diagnosis and treatment decisions.

• Some patients may develop arthritis, Raynaud’s disease, cutaneous lesions resembling lupus, scleroderma-like findings, sicca symptoms, myositis, thrombosis, or vasculitis.
• Some individuals may develop allergic manifestations related to food, drugs, or insect bites.

Frequently Asked Questions

What are Brazilian ticks?

Brazilian ticks include hard tick species such as Amblyomma and Rhipicephalus. These ticks differ from the classic Ixodes ticks associated with Lyme disease in the United States and Europe.

Are there ticks in Brazil?

Yes. Brazil has several human-biting tick species. Some have been investigated for their role in Lyme-like illness and other tick-borne diseases.

Is there Lyme disease in Brazil?

Researchers have described a Lyme-like illness in Brazil known as Baggio-Yoshinari syndrome. It shares features with Lyme disease but may differ in tick vectors, microbiologic findings, and clinical presentation.

Can Brazilian ticks cause a bullseye rash?

A bullseye-like erythema migrans rash has been reported in some patients with Brazilian Lyme-like syndrome. However, not every tick bite produces a rash, and not every rash confirms Lyme disease.

Why is Lyme-like disease in Brazil difficult to diagnose?

Diagnosis can be difficult because symptoms may mimic chronic fatigue syndrome, autoimmune disease, neurologic disorders, and other infections. Testing may help, but clinical context remains important.

Clinical Takeaway

Brazilian ticks may be associated with a Lyme-like illness known as Baggio-Yoshinari syndrome. This condition can resemble Lyme disease, with reported bullseye-like rash, neurologic symptoms, arthritis, eye findings, cardiac involvement, and recurrent systemic complaints.

Because Lyme-like disease in Brazil may not look exactly like classic Lyme disease in the United States or Europe, clinicians should consider tick exposure, geography, rash history, and multisystem symptoms together.

Related Articles

These related articles explore Lyme-like illness in Brazil, tick-borne disease diagnosis, autoimmune concerns, and neurologic complications.

Brazil faces the same problems with Lyme disease as seen in the USA
Confirmation of Borrelia burgdorferi in South America
Can Lyme disease trigger an autoimmune disease?
Lyme disease and Guillain-Barré syndrome
Neurologic Lyme disease

References

1. Miziara C, Gelmeti Serrano VA, Yoshinari NH. Passage of Borrelia burgdorferi through diverse Ixodid hard ticks causes distinct diseases: Lyme borreliosis and Baggio-Yoshinari syndrome. Clinics (Sao Paulo). 2018;73:e394.

---

Dr. Daniel Cameron, MD, MPH
Lyme disease clinician with over 30 years of experience and past president of ILADS.

Symptoms • Testing • Coinfections • Recovery • Pediatric • Prevention