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Tick-Borne Relapsing Fever

Aka: Tick-Borne Relapsing Fever, Relapsing Fever

I. Epidemiology

  1. Rare: <500 cases reported in U.S. in last 25 years
  2. Region
    1. U.S. West of the Mississippi River
    2. More common in mountains

II. Pathophysiology

  1. Cause: Spirochete in Borrelia genus
    1. Borrelia hermsii (hosts: Squirrels and chipmunks)
    2. Borrelia turicata (hosts: Cattle, rodents, pigs)
  2. Tick vector: Ornithodoros genus
  3. Exposure
    1. Mountain cabin with rodents
    2. Cave exploration
    3. Work under buidlings
  4. Relapsing Fever
    1. Infections often involve multiple Borrelia serotypes
    2. As one serotype is cleared, another proliferates
    3. May lie dormant in liver, Spleen, CNS, marrow
    4. Alternating serotypes, dormancy cause Relapsing Fever

III. Symptoms (follows 7 day incubation period)

  1. Fever
    1. Sudden onset, over 102.5 F (39.2 C)
    2. May rise over 104 F
    3. Pattern
      1. Fever for 3 to 6 days
      2. Febrile period ends with 30 minute crisis period
        1. Brief spike in pulse and Blood Pressure
        2. Sweats occur as the fever abates
      3. Fever recurs every 4 to 14 days
  2. Associated symptoms
    1. Headache, Myalgias, Arthralgias, and chills
    2. Nausea, Vomiting and Abdominal Pain

IV. Signs

  1. Hepatomegaly (10%) or Splenomegaly (6%)
  2. Meningitis (2%)
  3. Pneumonitis
  4. Myocarditis
  5. Iridiocyclitis
  6. Cranial Nerve palsy (e.g. Bell's Palsy, deafness)
  7. Altered Level of Consciousness (Delirium, coma)

V. Labs: Diagnosis

  1. Microscopic exam of blood, CSF other body fluid
    1. Thick and thin smears stained with Wright's or Giemsa
    2. Spirochetes identified
  2. Blood Cultures during febrile period
  3. Immunofluorescence and PCR not widely available

VI. Labs: Other findings

  1. Complete Blood Count
    1. Anemia
    2. Slight Leukocytosis
    3. Thrombocytopenia
  2. Liver Function Tests
    1. Increased Unconjugated Bilirubin
    2. Increased Aminotransferases
  3. Urinalysis
    1. Proteinuria and Hematuria

VII. Labs: If indicated

  1. Myocarditis suspected
    1. EKG with Prolonged QT interval (QTc)
  2. Meningitis suspected
    1. CSF mononuclear Pleocytosis and increased CSF Protein

VIII. Management

  1. First line
    1. Doxycycline 100 mg orally bid for 7-10 days
    2. Tetracycline 500 mg orally qid for 7-10 days
  2. Alternative
    1. Erythromycin 500 mg orally qid for 7-10 days
    2. Penicillins (IV only)

IX. Complications

  1. Jarisch-Herxheimer Reaction (54% of treated cases)
    1. Occurs with treatment
    2. Onset within 2 hours of starting treatment
    3. Observe for 12 to 24 hours after starting treatment

X. Prognosis

  1. Mortality <1% in treated cases
  2. Poor prognostic factors
    1. Myocarditis
    2. Altered Level of Consciousness
    3. Poor liver function
    4. Bleeding complications from multiple sites

XI. Prevention

  1. See Prevention of Tick-borne Infection
  2. Spray susceptible buildings with Malathion 0.5%
  3. Keep home free of rodents

XII. References

  1. Dworkin (2002) Med Clin North Am 86:417-33 [PubMed]
  2. Roscoe (2005) Am Fam Physician 72(10):2039-44 [PubMed]

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Ontology: Tick-borne relapsing fever (C0035022)

Concepts Disease or Syndrome (T047)
ICD9 087.1
ICD10 A68.1
SnomedCT 186821005, 10301003
English Relapsing fever, tick-borne, Tick-borne relapsing fever NOS, tick-borne relapsing fever (diagnosis), tick-borne relapsing fever, Tick-borne relaps fever, Tick-borne relapsing fever NOS (disorder), Tick-borne relapsing fever, Tick-borne relapsing fever (disorder), tick-borne; relapsing fever, Tick-borne relapsing fever, NOS, Tick-Born Relapsing Fever
Dutch febris recurrens, overgebracht door teken, door teken overgebrachte febris recurrens, teken; febris recurrens, Door teken overgebrachte febris recurrens
French Fièvre récurrente, transmise par tique, Fièvre récidivante transmise par tique
German Rueckfallfieber, von Zecken uebertragen, von Zecken uebertragenes Rueckfallfieber, Durch Zecken uebertragenes Rueckfallfieber
Italian Febbre ricorrente da zecche
Portuguese Febre recorrente transmitida por carraças
Spanish Fiebre recurrente transmitida por garrapatas, fiebre recurrente transmitida por garrapatas, SAI (trastorno), fiebre recurrente transmitida por garrapatas, SAI, fiebre recidivante transmitida por garrapatas (trastorno), fiebre recidivante transmitida por garrapatas
Japanese ダニ媒介性回帰熱, ﾀﾞﾆﾊﾞｲｶｲｾｲｶｲｷﾈﾂ
Czech Typhus recurrens přenášený klíštětem, Návratná hore�ka přenášená klíštětem
Korean 진드기 매개 재귀열
Hungarian Visszatérő láz, kullancs által terjesztett, Kullancs-által terjesztett visszatérő láz
Derived from the NIH UMLS (Unified Medical Language System)

Related Topics in Tick-Borne Disease

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