Diphtheria Outbreak in Haiti
The CDC has issued a Level 1 travel health alert regarding an active diphtheria outbreak in Haiti. Diphtheria is a serious bacterial infection caused by Corynebacterium diphtheriae that primarily affects the upper respiratory tract and can produce a life-threatening toxin affecting the heart and nervous system.
Key Information for Travelers
Disease Characteristics: Diphtheria is spread through respiratory droplets from infected individuals. The disease presents with symptoms including sore throat, fever, weakness, and potential airway obstruction. A characteristic grayish membrane may form in the throat, and complications include myocarditis and neuropathy.
Vaccination Status: Travelers should verify their diphtheria vaccination history prior to departure. The diphtheria toxoid is available as part of combination vaccines (DTaP, Tdap, DT, or Td formulations). Adults typically received primary series in childhood with booster doses recommended every 10 years. Td or Tdap booster may be indicated for travelers depending on individual history.
Pre-Travel Recommendations:
- Review vaccination records for diphtheria protection
- Consult healthcare providers at least 4-6 weeks before travel if updates are needed
- Maintain awareness of hygiene practices (hand hygiene, respiratory etiquette)
- Avoid close contact with individuals displaying respiratory symptoms
During Travel: Maintain standard infection-control practices. Seek medical attention immediately if respiratory symptoms develop during or after travel to Haiti.
Pharmacist's Note: Diphtheria is vaccine-preventable and largely eliminated in countries with robust immunization programs. However, outbreaks occur in regions with vaccination coverage gaps. As a healthcare professional, I emphasize that travelers should not delay vaccination verification—the diphtheria toxoid is well-established with excellent safety and efficacy profiles spanning decades. If you have specific health conditions or medication interactions affecting vaccine administration, consult your healthcare provider promptly rather than postponing travel health preparation. Post-exposure prophylaxis considerations exist and should be discussed with travel medicine specialists if exposure occurs.
Reference: CDC Travel Health Notices, Level 1 - Diphtheria in Haiti (June 25, 2026)