In some people, infection with diphtheria-causing bacteria causes only a mild illness — or no obvious signs and symptoms at all. Infected people who stay unaware of their illness are known as carriers of diphtheria. They're called carriers because they can spread the infection without being sick themselves.

Diphtheria signs and symptoms usually begin 2 to 5 days after a person becomes infected. Signs and symptoms may include:

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Contaminated personal or household items. People sometimes catch diphtheria from handling an infected person's things, such as used tissues or hand towels, that may be contaminated with the bacteria.

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Children who received all of the recommended vaccinations before age 7 should receive their first booster shot at around age 11 or 12. The next booster shot is recommended 10 years later, then repeated at 10-year intervals. Booster shots are particularly important if you travel to an area where diphtheria is common.

Some children — such as those with epilepsy or another nervous system condition — may not be able to get the DTaP vaccine.

After the initial series of vaccinations in childhood, you need booster shots of the diphtheria vaccine to help you maintain your immunity. That's because immunity to diphtheria fades with time.

The diphtheria vaccine is effective at preventing diphtheria. But there may be some side effects. Some children may experience a mild fever, fussiness, drowsiness or tenderness at the injection site after a diphtheria, tetanus and pertussis (DTaP) shot. Ask your doctor what you can do for your child to minimize or relieve these effects.

Before antibiotics were available, diphtheria was a common illness in young children. Today, the disease is not only treatable but also preventable with a vaccine.

Although it's more common in tropical climates, diphtheria on the skin also occurs in the United States. It may happen especially among people with poor hygiene who live in crowded conditions.

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The booster is given as a tetanus, diphtheria, and pertussis (Tdap) vaccine or as a diphtheria booster combined with the tetanus booster — the tetanus-diphtheria (Td) vaccine. This combination vaccine is given by injection, usually into the arm or thigh.

A second type of diphtheria can affect the skin, causing pain, redness and swelling similar to other bacterial skin infections. Ulcers covered by a gray membrane also may be a sign of skin diphtheria.

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Talk to your doctor about vaccines and booster shots if you're unsure of your vaccination status. A Tdap vaccine may also be recommended as part of the tetanus-diphtheria (Td) series for children ages 7 through 10 who aren't up to date with the vaccine schedule.

Diphtheria can be treated with medications. But in advanced stages, diphtheria can damage the heart, kidneys and nervous system. Even with treatment, diphtheria can be deadly, especially in children.

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Complications are very rare. In rare cases, the DTaP vaccine causes serious but treatable complications in a child, such as an allergic reaction (hives or a rash develops within minutes of the injection).

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Diphtheria (dif-THEER-e-uh) is a serious bacterial infection that usually affects the mucous membranes of the nose and throat. Diphtheria is extremely rare in the United States and other developed countries thanks to widespread vaccination against the disease. However, many countries with limited health care or vaccination options still experience high rates of diphtheria.

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With treatment, most people with diphtheria survive these complications, but recovery is often slow. Diphtheria is fatal about 5% to 10% of the time. Rates of death are higher in children under age 5 or adults older than age 40.

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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 vaccinations are current.

Diphtheria rarely occurs in the United States and Western Europe, where children have been vaccinated against the condition for decades. However, diphtheria is still common in developing countries where vaccination rates are low.

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If the diphtheria toxin damages the nerves that help control muscles used in breathing, these muscles may become paralyzed. At that point, you might need mechanical assistance to breathe.

In areas where diphtheria vaccination is standard, the disease is mainly a threat to unvaccinated or inadequately vaccinated people who travel internationally or have contact with people from less developed countries.

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The diphtheria, tetanus and pertussis vaccine is one of the childhood vaccinations that doctors in the United States recommend during infancy. Vaccination consists of a series of five shots, typically administered in the arm or thigh, given to children at these ages:

The vaccine for Tdap is an alternative vaccine for adolescents ages 11 through 18 and adults who haven't previously had a booster. It's also recommended once during pregnancy, regardless of previous vaccinations.

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The diphtheria vaccine is usually combined with vaccines for tetanus and whooping cough (pertussis). The three-in-one vaccine is known as the diphtheria, tetanus and pertussis vaccine. The latest version of this vaccine is known as the DTaP vaccine for children and the Tdap vaccine for adolescents and adults.

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Diphtheria is caused by the bacterium Corynebacterium diphtheriae. The bacterium usually multiplies on or near the surface of the throat or skin. C. diphtheriae spreads through:

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People who have been infected by the diphtheria bacteria and who haven't been treated can infect people who haven't had the diphtheria vaccine — even if they don't show any symptoms.

Nerve damage. The toxin can also cause nerve damage. Typical targets are nerves to the throat, where poor nerve conduction may cause difficulty swallowing. Nerves to the arms and legs also may become inflamed, causing muscle weakness.