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Cutaneous diphtheria is increasingly being seen in association with burns and in individuals with poor personal hygiene. Typically the ulcer is punched-out with undermined edges and is covered with a greyish white to brownish adherent membrane. Constitutional symptoms are uncommon.

Diagnosis

This must be made on clinical grounds since therapy is usually urgent and bacteriological results of culture studies and toxin production cannot be awaited.

Treatment

The patient should be isolated and bed rest advised. Antitoxin therapy is the only specific treatment. It must be given promptly to prevent further fixation of toxin to tissue receptors, since fixed toxin is not neutralized by antitoxin. Depending on the severity, 20 000-100 000 units of horse-serum antitoxin should be administered intramuscularly after an initial test dose to exclude any allergic reaction. Intravenous therapy may be required in a very severe case. There is a risk of acute anaphylaxis after antitoxin administration and of serum sickness 2-3 weeks later.However, the risk of death outweighs the problems of anaphylaxis. Antibiotics should be administered concurrently to eliminate the organisms and thereby remove the source of toxin production. Benzylpenicillin 1.2 g four times daily is given for 1 week.

The cardiac and neurological complications need intensive therapy.

Prevention

Diphtheria is prevented by active immunization in childhood. Booster doses should be given to those travelling to endemic areas if more than 10 years has elapsed following their primary course of immunization. All contacts of the patient should have throat swabs sent for culture; those with a positive result should be treated with penicillin or erythromycin and active immunization or a booster dose of toxoid given.