Diphtheria

What is Diphtheria?

Diphtheria is a serious bacterial infection caused by Corynebacterium diphtheriae. The bacteria produce a toxin that damages tissues in the throat and nose. A thick gray or white coating often forms in the throat, making it hard to breathe or swallow.

The infection spreads through respiratory droplets when an infected person coughs or sneezes. It can also spread by touching contaminated objects. Diphtheria was once a leading cause of death in children, but vaccination has made it rare in developed countries.

Today, diphtheria mostly occurs in areas with low vaccination rates or in people who never completed their vaccine series. Your immune system needs antibodies called antitoxoids to fight the diphtheria toxin. Without protection, the infection can spread to your heart, kidneys, and nervous system.

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Symptoms

Thick gray or white coating in the throat or on the tonsils
Sore throat and hoarseness
Swollen glands in the neck, sometimes called bull neck
Difficulty breathing or rapid breathing
Difficulty swallowing
Fever and chills
Fatigue and weakness
Nasal discharge that may be bloody
Skin lesions in tropical regions

Some people may carry the bacteria without showing symptoms. However, they can still spread the infection to others. Early symptoms can look like a common cold, which delays diagnosis and treatment.

Causes and risk factors

Diphtheria is caused by the bacterium Corynebacterium diphtheriae. The bacteria release a powerful toxin that kills healthy cells in the respiratory tract. Close contact with an infected person is the most common way the disease spreads. People who are not vaccinated or have incomplete vaccine series face the highest risk.

Risk factors include living in crowded or unsanitary conditions, traveling to countries where diphtheria is common, and having a weakened immune system. Children under five and adults over 60 are more vulnerable. People who delay or skip recommended booster shots may lose immunity over time, even if they were vaccinated as children.

How it's diagnosed

Doctors diagnose diphtheria by examining the throat for the characteristic gray coating. They collect a sample from the throat or nose to test for the bacteria in a lab. This culture test confirms whether Corynebacterium diphtheriae is present.

Blood tests can check your immunity level by measuring diphtheria antitoxoid antibodies. Low levels indicate you lack protection against the toxin. If you suspect exposure or want to verify your immunity status, talk to a doctor about testing options. Specialized labs perform these immunity tests, which are not part of routine blood panels.

Treatment options

Diphtheria antitoxin administered as soon as possible to neutralize the bacterial toxin
Antibiotics such as penicillin or erythromycin to kill the bacteria
Isolation in a hospital to prevent spreading the infection
Breathing support if airways are blocked by the throat coating
Heart monitoring because the toxin can damage heart muscle
Vaccination after recovery to build immunity and prevent future infections
Complete rest during recovery to allow your body to heal

Frequently asked questions

Diphtheria is caused by the bacterium Corynebacterium diphtheriae, which produces a toxin that damages tissues. The infection spreads through respiratory droplets when infected people cough or sneeze. You can also get it by touching contaminated objects or surfaces.

A blood test can measure your diphtheria antitoxoid antibody levels to check your immunity. Low antibody levels mean you have little protection against the infection. Your doctor can order this test if you're concerned about your immunity status or planning travel to high-risk areas.

Yes, diphtheria is highly contagious. It spreads through respiratory droplets and close contact with infected people. Some people can carry and spread the bacteria without showing any symptoms. Infected individuals should be isolated until antibiotics eliminate the bacteria.

The diphtheria vaccine is very effective at preventing infection. It's typically given as part of the DTaP vaccine for children and Tdap for adolescents and adults. Booster shots are needed every 10 years because immunity fades over time.

Untreated diphtheria can cause serious complications and death. The toxin can damage your heart muscle, kidneys, and nerves. The throat coating can completely block your airway, making it impossible to breathe. About 1 in 10 people with diphtheria die, even with treatment.

Yes, adults can get diphtheria, especially if they never completed their vaccine series or haven't had boosters. Immunity from childhood vaccines fades over time without booster shots. Adults over 60 and those with weakened immune systems face higher risk.

Symptoms typically appear 2 to 5 days after exposure to the bacteria. This period is called the incubation period. Early symptoms often resemble a cold, which can delay diagnosis and treatment.

Diphtheria is rare in countries with strong vaccination programs. However, it still occurs in areas with low vaccination rates and poor sanitation. Travelers to certain parts of Asia, Africa, and Eastern Europe may face higher risk.

Contact your doctor immediately if you were exposed to someone with diphtheria. You may need antibiotics to prevent infection, even if you feel fine. Your doctor will also check your vaccination history and may give you a booster shot.

No natural method provides reliable protection against diphtheria like vaccination does. The vaccine trains your immune system to produce antibodies that fight the bacterial toxin. Good hygiene and avoiding close contact with infected people can reduce spread but won't build immunity.