Diphtheria is a bacterial disease (corynebacterium diphtheriae) that has an [incubation period] of one week.  The symptoms include a sore throat, fever, swelling of the lymph nodes, and a thick grayish membrane forms over the tonsils and pharynx which can cause difficulty breathing and swallowing.  Diphtheria can also affect the heart, kidneys, and nervous system.  Diphtheria is cured with an antitoxin that neutralizes the toxin.  Respirators and antibiotics are used to minimize the complications.  [Vaccine] and booster shots for diphtheria were developed in 1920.

-In the late 1800's, diphtheria epidemics spread throughout the United States and Europe until 1920, when a vaccine was developed.

-The only way to keep diphtheria out of the United States is to maintain the highest level of immunization possible through vaccination.

-Diphtheria is spread through a cough or a sneeze.

-Diphtheria is Greek for a piece of leather, referring to the tough gray mucous membrane blocking the throat.