Diphteria
DEFINITION
Diphtheria (dif-THEER-e-uh) is a serious bacterial infection usually affecting the mucous membranes of your nose and throat. Diphtheria typically causes a sore throat, fever, swollen glands and weakness. But the hallmark sign is a sheet of thick, gray material covering the back of your throat, which can block your airway, causing you to struggle for breath.
Diphtheria is extremely rare in the United States and other developed countries, thanks to widespread vaccination against the disease.
Medications are available to treat diphtheria. However, in advanced stages, diphtheria can damage your heart, kidneys and nervous system. Even with treatment, diphtheria can be deadly — up to 3 percent of people who get diphtheria die of it. The rate is higher for children under 15.
CAUSES
The bacterium Corynebacterium diphtheriae causes diphtheria. Usually C. diphtheriae multiply on or near the surface of the mucous membranes of the throat. C. diphtheriae spreads via three routes:
- Airborne droplets. When an infected person’s sneeze or cough releases a mist of contaminated droplets, people nearby may inhale C. diphtheriae. Diphtheria spreads efficiently this way, particularly in crowded conditions.
- Contaminated personal items. People occasionally catch diphtheria from handling an infected person’s used tissues, drinking from the person’s unwashed glass, or coming into similarly close contact with other items on which bacteria-laden secretions may be deposited.
- Contaminated household items. In rare cases, diphtheria spreads on shared household items, such as towels or toys.
You can also come in contact with diphtheria-causing bacteria by touching an infected wound.
People who have been infected by the diphtheria bacteria and who haven’t been treated can infect nonimmunized people for up to six weeks — even if they don’t show any symptoms.
SYMPTOMS
Diphtheria signs and symptoms usually begin two to five days after a person becomes infected and may include:
- A thick, gray membrane covering your throat and tonsils
- A sore throat and hoarseness
- Swollen glands (enlarged lymph nodes) in your neck
- Difficulty breathing or rapid breathing
- Nasal discharge
- Fever and chills
- Malaise
In some people, infection with diphtheria-causing bacteria causes only a mild illness — or no obvious signs and symptoms at all. Infected people who remain unaware of their illness are known as carriers of diphtheria, because they can spread the infection without being sick themselves.
Skin (cutaneous) diphtheria
- A second type of diphtheria can affect the skin, causing the typical pain, redness and swelling associated with other bacterial skin infections. Ulcers covered by a gray membrane also may develop in cutaneous diphtheria.
- Although it’s more common in tropical climates, cutaneous diphtheria also occurs in the United States, particularly among people with poor hygiene who live in crowded conditions.
When to see a doctor
Call your family doctor immediately if you or your child has been exposed to someone with diphtheria. If you’re not sure whether your child has been vaccinated against diphtheria, schedule an appointment. Make sure your own immunizations are current.
