diphtheria

American  

[dif-theer-ee-uh, dip-] / dɪfˈθɪər i ə, dɪp- /

noun

Pathology.

1. a febrile, infectious disease caused by the bacillus Corynebacterium diphtheriae, and characterized by the formation of a false membrane in the air passages, especially the throat.

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diphtheria British  

/ dɪf-, dɪf-, dɪpˈθɪərɪə, ˌdɪpθəˈrɪtɪk, dɪpˈθɛrɪk, dɪf- /

noun

1. an acute contagious disease caused by the bacillus Corynebacterium diphtheriae, producing fever, severe prostration, and difficulty in breathing and swallowing as the result of swelling of the throat and formation of a false membrane

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diphtheria Scientific  

/ dĭf-thîr′ē-ə,dĭp- /

1. An infectious disease caused by the bacterium Corynebacterium diphtheriae and characterized by fever, swollen glands, and the formation of a membrane in the throat that prevents breathing. Infants are routinely vaccinated against diphtheria, which was once a common cause of death in children.

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diphtheria Cultural  

1. An acute disease, and a contagious disease, caused by bacteria that invade mucous membranes in the body, especially those found in the throat. The bacteria produce toxic substances that can spread throughout the body.

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Discover More

In developed countries, diphtheria has been virtually wiped out through an active program of infant immunization.

Other Word Forms

Derived Forms

• diphtheroid
  adjective
• diphtherial
  adjective

Etymology

Origin of diphtheria

1850–55; < New Latin < French diphthérie < Greek diphthér ( a ) skin, leather + -ia -ia

Explanation

Diphtheria is a serious disease that spreads between people through sneezes and coughs. Luckily, diphtheria is easily prevented with a vaccine that's commonly given to babies. Most people who get diphtheria can expect to spend a week or so feeling pretty awful, with a cough, sore throat, and fever. For others, diphtheria is dangerous and even deadly, killing tissues in the airway and making it difficult to breathe, and sometimes damaging the heart. In most of the world, diphtheria vaccines are readily available. In Greek, the word diphtheria means "leather," a reference to the leathery coating the disease can cause in the throat.

Example Sentences

On Tuesday, NT's health minister said autopsy results from an overseas lab found diphtheria was the cause of a man's death in April at Royal Darwin Hospital, the first such case since 2018.

From BBC • May 26, 2026

In 1962, President Kennedy signed the Vaccination Assistance Act, which ensured that all children under five, regardless of income, could receive vaccines against polio, diphtheria, whooping cough and tetanus.

From Salon • Jan. 4, 2026

Outbreaks of measles, diphtheria and severe diarrhea are afflicting more children and taking place more frequently because of a drop in vaccinations, health officials in Somalia’s southwest state said.

From The Wall Street Journal • Dec. 4, 2025

In late 2022, thousands of migrants were placed in tents at Manston, leading to overcrowding and disease, including diphtheria.

From BBC • Oct. 28, 2025

These are the used sections—broken bones, cuts, bruises, mumps, measles, backache, scarlet fever, diphtheria, rheumatism, female complaints, hernia, and of course everything to do with pregnancy and the birth of children.

From "East of Eden" by John Steinbeck