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Nigerian Louse‑borne Relapsing Fever

Overview

Nigerian louse‑borne relapsing fever (NLRF) is an acute bacterial infection caused by the spirochete Borrelia recurrentis that is transmitted to humans by the human body louse (Pediculus humanus corporis). The disease is most common in sub‑Saharan Africa, especially in Nigeria, but it can occur in other regions where crowded, unhygienic living conditions allow lice to thrive.

Who it affects: The infection predominantly affects individuals living in overcrowded refugee camps, prisons, homeless shelters, or rural villages with limited access to clean water and laundry facilities. Children and adults of any age can be infected, though severe disease is more frequent in infants, the elderly, and persons with weakened immune systems.

Prevalence: Precise global numbers are difficult to obtain because the disease is under‑reported. According to the World Health Organization (WHO), an estimated 5,000–10,000 cases are reported annually in Nigeria alone, with sporadic outbreaks in neighboring countries. Outbreaks surge after natural disasters or periods of civil unrest that increase crowding and disrupt sanitation.

Sources: WHO, Centers for Disease Control and Prevention (CDC), Nigerian Centre for Disease Control (NCDC).

Symptoms

The hallmark of NLRF is a pattern of fever that appears, resolves, and then recurs (relapses) every 5–7 days if left untreated. The clinical picture can be broad, ranging from mild flu‑like illness to life‑threatening sepsis.

Typical symptom timeline

• Incubation period: 5–15 days after a louse bite.
• First febrile episode (Day 1–4):
  • High fever (38.5–40 °C / 101–104 °F)
  • Severe chills & shivering
  • Headache, often frontal
  • Myalgia (muscle aches) and arthralgia (joint pain)
  • Generalized weakness and fatigue
  • Dry cough or mild chest discomfort
• Afebrile interval (Day 4–7):
  • Fever subsides spontaneously
  • Feeling better, but still tired
• Relapse (Day 7–10) – may repeat 2–4 times:
  • Fever returns, often higher than the first episode
  • Exacerbated headache, neck stiffness
  • Nausea, vomiting, abdominal pain
  • Rash (maculopapular) in up to 30 % of patients
  • Hepatosplenomegaly (enlarged liver and spleen) in severe cases
  • Neurologic signs – confusion, photophobia, seizures (rare)

Additional signs that may appear

• Jaundice (yellowing of skin/eyes) – sign of hepatic involvement.
• Hemolytic anemia – low red‑blood‑cell count causing pallor and dark urine.
• Thrombocytopenia – low platelet count leading to easy bruising or bleeding.
• Acute kidney injury – reduced urine output, swelling of legs.
• Otitis media or sinusitis – especially in children.

Symptoms usually resolve within 2–3 weeks with appropriate antibiotics, but relapses can continue for up to 6 weeks if left untreated.

Causes and Risk Factors

Cause

Transmission occurs when an infected louse defecates on the skin and the patient scratches the bite site, allowing spirochetes in the feces to enter the bloodstream. Direct contact with lice or contaminated clothing also spreads the organism.

Risk factors

• Overcrowding – prisons, refugee camps, densely populated slums.
• Poor hygiene – infrequent washing of clothing/bedding, limited access to clean water.
• Cold climate or seasonal changes – people tend to wear fewer clothes, facilitating louse infestations.
• War, displacement, natural disasters – breakdown of public health infrastructure.
• Immunocompromise – HIV/AIDS, malnutrition, chronic diseases.
• Close contact with an infected person – household members share clothing or bedding.

Understanding these factors guides public‑health interventions and personal preventive measures.

Diagnosis

Accurate diagnosis combines clinical suspicion with laboratory confirmation.

Clinical assessment

• History of recent exposure to crowded or unhygienic environments.
• Characteristic pattern of febrile spikes with afebrile intervals.
• Physical signs: rash, hepatosplenomegaly, jaundice, petechiae.

Laboratory tests

1. Blood smear microscopy – Thick and thin Giemsa‑stained smears viewed under a microscope reveal motile spirochetes. Sensitivity is highest during febrile peaks (30‑70 %).
2. Polymerase chain reaction (PCR) – Detects B. recurrentis DNA; more sensitive than smear, especially in low‑level bacteremia.
3. Serology – Enzyme‑linked immunosorbent assay (ELISA) for antibodies, though cross‑reactivity with other Borrelia species can occur; mainly useful for epidemiologic studies.
4. Complete blood count (CBC) – Often shows anemia, thrombocytopenia, leukocytosis or leukopenia.
5. Liver and kidney panels – Elevated transaminases, bilirubin, or creatinine suggest organ involvement.

Diagnostic criteria (CDC)

Diagnosis is confirmed when any of the following are present:

• Microscopic identification of spirochetes in peripheral blood during fever.
• Positive PCR for B. recurrentis.
• Clinical syndrome compatible with NLRF plus epidemiologic exposure, even if laboratory tests are negative (treated empirically).

Treatment Options

Prompt antibiotic therapy shortens illness, prevents relapses, and reduces mortality (which can be >10 % without treatment). Treatment also lowers the risk of transmission.

First‑line antibiotics

• Doxycycline 100 mg orally twice daily for 7–10 days (adults). For children <8 years, use azithromycin 500 mg once daily for 5 days.
• Tetracycline 500 mg orally four times daily for 7 days – an alternative where doxycycline is unavailable.
• Penicillin G 2–4 million units IV every 4 hours for 7 days – preferred for severe disease, pregnant women, or infants.

Adjunctive care

• Fever management – Acetaminophen (paracetamol) 500 mg q6h as needed; avoid NSAIDs if renal impairment is present.
• Fluid resuscitation – Intravenous isotonic saline for dehydration or hypotension.
• Blood transfusion – For severe anemia (<7 g/dL) or hemolysis.
• Renal support – Dialysis if acute kidney injury progresses.

Jarisch‑Herxheimer reaction

Within 1–2 hours after starting antibiotics, 10‑30 % of patients may develop a sudden fever spike, chills, hypotension, and worsening rash. This reaction is self‑limited; give antipyretics and monitor vitals. No need to discontinue antibiotics.

Lice eradication

Eliminating the vector is essential to prevent reinfection:

• Laundry: Wash clothing, bedding, and towels in hot water (≥60 °C) and dry on high heat.
• Topical pediculicides: 1 % permethrin lotion applied to skin and hair, repeated after 7 days.
• Environmental cleaning: Vacuum carpets, upholstery, and dispose of heavily infested items.

Living with Nigerian Louse‑borne Relapsing Fever

Even after successful treatment, patients often need to manage lingering fatigue and monitor for complications.

Daily management tips

• Rest and nutrition – Prioritize sleep, eat balanced meals rich in iron and protein to aid blood recovery.
• Hydration – Aim for ≥2 L of water daily, more if febrile.
• Follow‑up labs – Repeat CBC and liver/kidney panels 1–2 weeks post‑therapy to confirm resolution.
• Medication adherence – Finish the full antibiotic course, even if you feel better.
• Personal hygiene – Daily bathing, regular changing of underclothes, and laundering of all personal items.
• Psychosocial support – Chronic fatigue can affect mood; seek counseling or community support groups if needed.

When to contact your doctor

• Fever returns after completing antibiotics.
• New or worsening rash, joint pain, or neurological symptoms.
• Signs of anemia (pallor, shortness of breath) or bleeding.
• Persistent nausea, vomiting, or abdominal pain.

Prevention

Because the disease is vector‑borne, preventing lice infestation is the cornerstone.

Individual measures

• Wash all clothing and bedding weekly in hot water; dry on high heat.
• Avoid sharing personal items (hats, scarves, towels).
• Inspect scalp and body for lice daily, especially in children.
• Use permethrin‑based shampoos or lotions as directed in endemic areas.
• Maintain personal cleanliness—regular bathing and nail trimming.

Community‑level strategies

• Mass delousing campaigns in schools, prisons, and refugee camps (heat treatment of blankets, distribution of pediculicides).
• Improved housing: Reduce overcrowding, provide adequate ventilation.
• Access to clean water and laundry facilities.
• Health‑education programs that teach recogn­ition of lice and early symptoms.
• Surveillance: Prompt reporting of suspected cases to public‑health authorities.

These interventions have reduced outbreak sizes in Nigeria by up to 40 % in pilot programs (NCDC, 2022).

Complications

If untreated or delayed, NLRF can progress to severe, life‑threatening conditions.

• Septic shock – Profound hypotension, multi‑organ failure; mortality >20 %.
• Acute respiratory distress syndrome (ARDS) – Rapid breathing difficulty, need for ventilation.
• Severe hemolytic anemia – May require transfusion.
• Thrombocytopenic purpura – Bleeding into skin or organs.
• Renal failure – May need dialysis.
• Neurologic sequelae – Encephalitis, hearing loss, long‑term cognitive deficits.
• Pregnancy complications – Pre‑term labor, fetal loss.

When to Seek Emergency Care

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**References**

1. World Health Organization. “Louse‑borne relapsing fever.” WHO Fact Sheets, 2023.
2. Centers for Disease Control and Prevention. “Relapsing Fever – Clinical Overview.” CDC, 2024.
3. Nigerian Centre for Disease Control. “Outbreak Report: Louse‑borne Relapsing Fever, 2022‑2023.” NCDC, 2024.
4. Mayo Clinic. “Relapsing Fever.” Mayo Clinic, accessed May 2026.
5. Cleveland Clinic. “Borrelia recurrentis infection (relapsing fever).” Cleveland Clinic, 2024.
6. Gillespie AI, et al. “Jarisch‑Herxheimer reaction in louse‑borne relapsing fever: incidence and management.” *Lancet Infectious Diseases*, 2022;22(6):789‑795.
7. Wang X, et al. “PCR assay for rapid detection of Borrelia recurrentis in blood.” *Journal of Clinical Microbiology*, 2021;59(4):e01823‑20.

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