Massive cytokine release within hours of antibiotic initiation
Parallels JHR in syphilis and leptospirosis
Organ injury mechanisms
Thrombocytopenia
Immune-mediated platelet destruction
Sequestration in enlarged spleen
Hepatic injury
Direct spirochetal invasion
Immune-mediated hepatocyte damage
Neurologic invasion
Blood-brain barrier penetration
Spirochetes detectable in CSF in meningitis cases
Cardiac involvement
Myocarditis from direct invasion and immune injury
Conduction abnormalities possible
Therapeutic Considerations
Antibiotic selection rationale
Doxycycline preferred for TBRF
Superior relapse prevention compared to penicillin
Single-dose regimens less effective than multi-day courses
Tetracycline class mechanism
Inhibits protein synthesis at 30S ribosomal subunit
Bacteriostatic against Borrelia species
Ceftriaxone for CNS disease
Superior CSF penetration
Beta-lactam bactericidal against Borrelia
JHR prevention and management considerations
Cannot be reliably prevented with current agents
Slower antibiotic administration not proven preventive
Pre-treatment with TNF-alpha inhibitors investigational
Patient and staff preparation essential
IV access before first dose
Vital sign monitoring protocol established
Treatment failure and relapse
Relapse after treatment most common with penicillin
Repeat a full course of doxycycline
Confirm diagnosis by repeat smear or PCR
Persistent B miyamotoi in immunocompromised
Prolonged therapy may be required
Infectious disease guidance essential
Prevention principles
Tick bite prevention in endemic areas
Insect repellents with DEET or permethrin
Rodent control in cabin and dwelling settings
Louse control for LBRF prevention
Personal hygiene and delousing programs
Clothing changes and fumigation in camp settings
Patient Discharge Instructions
copy discharge instructions
Relapsing fever home care instructions
Take all antibiotics exactly as prescribed
Finish the entire course even if feeling better
Do not skip doses
Rest and hydration
Drink plenty of fluids especially water
Rest until fever has fully resolved
Photosensitivity precaution with doxycycline
Avoid prolonged direct sun exposure
Use sunscreen and protective clothing
Warning signs to return to emergency room
High fever returning after seeming to improve
May indicate a relapse episode
Relapsing pattern is characteristic of this illness
Severe shaking or rigors that do not settle within a few hours
May indicate a reaction to antibiotics
Nosebleed that does not stop with 15 to 20 minutes of pressure
Go to the ER immediately
Vomiting blood or black tarry stools
Emergency return immediately
Confusion or unusual behavior
Neurologic involvement requires urgent care
Difficulty breathing or chest pain
Return to emergency immediately
Yellowing of skin or eyes (jaundice)
Sign of liver involvement
Facial drooping or weakness
Facial nerve involvement
Inability to keep fluids down
Unable to take oral antibiotics
Follow-up plan
Follow up with physician within 5 to 7 days
Repeat blood tests to confirm platelet recovery
Confirm treatment response
Report any new episode of fever
Relapses occur in some patients
May need a repeat treatment course
Prevention after discharge
Avoid sleeping in rustic cabins without proper pest control
Rodent exclusion reduces soft tick exposure
Report exposure to public health if relevant cluster
Tick avoidance measures ongoing
Use DEET-containing repellents in endemic areas
Permethrin-treated clothing for outdoor activities
References
Guidelines and key sources
Infectious disease guideline sources
IDSA guidelines on tick-borne illnesses
Include recommendations for doxycycline as first-line for tick-borne infections
CDC relapsing fever clinical guidance
Diagnostic and treatment recommendations for TBRF and LBRF
WHO guidelines for louse-borne relapsing fever in refugee settings
Single-dose regimens for mass treatment contexts
Key clinical evidence
Dworkin et al studies on tick-borne relapsing fever epidemiology and treatment outcomes
Western US TBRF case series
Doxycycline versus penicillin relapse rates
Cadavid and Barbour: neuroborreliosis in relapsing fever
CNS invasion and meningitis management
Bryceson et al: louse-borne relapsing fever in Ethiopia
JHR characterization and meptazinol trials
Schwan and Piesman: B miyamotoi hard-tick relapsing fever
Epidemiology in Ixodes tick populations
Coding standards
ICD-10 A68.0 louse-borne relapsing fever
ICD-10 A68.1 tick-borne relapsing fever
ICD-10 A68.9 relapsing fever unspecified
SNOMED CT relapsing fever disorder concept
SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.