Diphtheria
Diphtheria (pronounced "diff-THEER-ee-uh") is an infectious disease caused by a bacterium called Corynebacterium diphtheriae. It can be treated by special drugs, or by antibiotics. There is a vaccine which can prevent diphtheria. In 1942, there were 50,804 diphtheria cases in England and Wales; now there is about one case a year.[1]
Diphtheria can cause serious problems, like:
- Inflammation of the heart, which can lead to death
- Different forms of paralysis, by poisoning of nerve cells
- Pneumonia
- Encephalitis
- Problems with the kidneys
Signs and symptoms
Signs and symptoms of diphtheria usually begin two to five days after a person gets infected. They may include:
- A thick, gray membrane covering the throat and tonsils
- A sore throat and a hoarse voice
- Swollen glands (enlarged lymph nodes) in the neck
- Trouble breathing, or fast breathing
- Nasal discharge
- Fever and chills
- Malaise (feeling very tired and not having any energy)
In some people, infection with diphtheria-causing bacteria causes only a mild illness. These people may have no obvious signs or symptoms. Infected people who do not know they have diphtheria are called carriers of diphtheria, because they can spread the infection without being sick themselves.
Cutaneous diphtheria
A second type of diphtheria can affect the skin. This type of diphtheria is called cutaneous diphtheria. It causes pain, redness, and swelling on the skin, like other bacterial skin infections. People with cutaneous diphtheria may get ulcers, covered by a gray membrane, on their skin.
Cutaneous diphtheria is more common in tropical climates. However, cutaneous diphtheria also happens in the United States, especially among people with poor hygiene who live in crowded conditions.
Mechanism
Diphtheria toxin is produced by C. diphtheriae only when infected with a bacteriophage which integrates the toxin-encoding genetic elements into the bacteria.[2][3]
Diphtheria Media
An adherent, dense, grey pseudomembrane covering the tonsils is classically seen in diphtheria.
Diphtheria cases reported to the World Health Organization between 1997 and 2006:* no data* 1–49 reported cases* Between 50–99 reported cases* Over 100 reported cases
A diphtheria immunisation scheme in London (1941).
A poster from the United Kingdom advertising diphtheria immunization (published prior to 1962).
References
- ↑ "A Fresh Shot". Policy Exchange. Retrieved 2023-10-20.
- ↑ Freeman, Victor J (1951). "Studies on the virulence of bacteriophage-infected strains of Corynebacterium diphtheriae". Journal of Bacteriology. 61 (6): 675–688. doi:10.1128/JB.61.6.675-688.1951. PMC 386063. PMID 14850426.
- ↑ Freeman VJ, Morse IU; Morse (1953). "Further observations on the change to virulence of bacteriophage-infected avirulent strains of Corynebacterium Diphtheriae". Journal of Bacteriology. 63 (3): 407–414. doi:10.1128/JB.63.3.407-414.1952. PMC 169283. PMID 14927573.