Diphtheria
Bacterial infection causing severe respiratory obstruction and systemic complications.
Diphtheria is an infection caused by the bacterium Corynebacterium diphtheriae. Most infections are asymptomatic or mild, but in some outbreaks the mortality rate approaches 10%.
- caused_by
- Corynebacterium diphtheriae
- first_described
- 5th century BC by Hippocrates
- transmission
- Direct contact, airborne, contaminated objects
- vaccine_introduced
- 1920s
Lore & Background
Diphtheria is caused by Corynebacterium diphtheriae, which produces an exotoxin responsible for lethality and symptoms. The toxin is encoded by a bacteriophage integrated into the bacterial genome. Signs and symptoms usually start two to five days after exposure, beginning with sore throat and fever. In severe cases, a grey or white pseudomembrane forms in the throat, which can block the airway and lead to strangulation and death. The disease can also involve skin, eyes, or genitals, and cause complications such as myocarditis, nerve inflammation, kidney problems, and bleeding due to low platelets.
Reader's Guide
Diphtheria is significant as a historically deadly disease that has been largely controlled by vaccination. The diphtheria vaccine, introduced in the 1920s and widely adopted after World War II, uses an inactivated toxoid to trigger antitoxin immunity. It is given in combination with tetanus and pertussis vaccines, with boosters every ten years. The disease remains common in sub-Saharan Africa, South Asia, and Indonesia, and can re-emerge in developed areas if vaccination rates drop. Treatment includes antibiotics such as erythromycin or benzylpenicillin, and severe cases may require tracheotomy. The variability in lethality is due to different strains of C. diphtheriae and their toxin production.
Did You Know?
- The pseudomembrane in diphtheria is a tough, leathery layer of dead tissue that can block the airway.
- Diphtheria toxin inhibits protein synthesis by ADP-ribosylating elongation factor EF-2.
- Asymptomatic transmission and chronic infection are possible.
- The disease was first described by Hippocrates in the 5th century BC.
Frequently Asked Questions
Who is Diphtheria?
Diphtheria is a bacterial infection driven by the pathogen Corynebacterium diphtheriae. Although the majority of cases remain mild or completely silent, the condition can turn deadly during outbreaks, with mortality climbing toward 10% in the worst scenarios.
What are Diphtheria's powers or role in the body?
Diphtheria's signature ability is producing a thick membrane that obstructs the airways, making breathing extremely difficult. Beyond the throat, it releases toxins that trigger systemic complications affecting organs throughout the body.
How does Diphtheria spread between hosts?
It transmits through direct person-to-person contact, airborne droplets, and even by touching contaminated objects. This range of routes lets it move easily through crowded or poorly sanitized environments.
When did Diphtheria first appear in the medical canon?
The condition was first described by Hippocrates in the 5th century BC, making it one of the oldest recognized entries in the infectious-disease catalog. That means it has been a known adversary for over two millennia.
How was Diphtheria ultimately brought under control?
The rollout of a vaccine beginning in the 1920s dramatically curtailed its lethality and incidence. Even so, in regions where vaccination coverage is low, severe outbreaks can still carry a mortality rate approaching 10%.
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