Diphtheria Outbreaks in Sub-Saharan Africa
The CDC has issued a Level 1 travel health alert regarding diphtheria outbreaks across multiple Sub-Saharan African nations. Active transmission has been confirmed in Chad, Guinea, Niger, Nigeria, Mali, Mauritania, and Somalia.
About Diphtheria
Diphtheria is a serious bacterial infection caused by Corynebacterium diphtheriae. The disease primarily affects the respiratory system and can produce a characteristic thick membrane in the throat that may obstruct airways. Complications include myocarditis (heart inflammation) and neuropathy (nerve damage), with potential for severe morbidity and mortality if untreated.
Disease Transmission
Diphtheria spreads through respiratory droplets from infected individuals, making close-contact settings particularly high-risk. The disease is vaccine-preventable but has re-emerged in areas with declining immunization coverage.
Recommendations for Travelers
Vaccination Status: Travelers should verify their diphtheria vaccination history before departure. The standard vaccination series consists of the diphtheria toxoid component, typically administered as part of combination vaccines (DPT, Tdap, or Td). Booster doses are recommended per CDC guidelines.
Pre-Travel Consultation: Individuals planning travel to affected regions should consult with a healthcare provider at least 4–6 weeks prior to departure for immunization assessment and updates.
General Precautions: Practice respiratory hygiene, frequent handwashing, and avoid close contact with individuals displaying respiratory symptoms.
Pharmacist's Note
Diphtheria immunity wanes over time; adults who completed childhood vaccination series should confirm booster status with their healthcare provider. Those with uncertain vaccination history should prioritize verification before travel. Unlike some travel vaccines administered on short notice, diphtheria protection requires either prior vaccination or primary series initiation—plan accordingly. Pharmacists in retail and travel health settings can assist with vaccination history review and facilitate timely administration of indicated boosters.
Additional Resources
Travelers should consult the CDC's travel health website for country-specific guidance and current outbreak updates before finalizing travel plans.
Alert Date: June 2, 2026