Types of Anthrax

There are three major anthrax types: cutaneous, inhalation, and gastrointestinal. Of the three different types, the most common is cutaneous anthrax, which occurs when the bacteria enter a cut or abrasion on the skin. The gastrointestinal form occurs as a result of eating meat contaminated with Bacillus anthracis bacteria. Inhalation anthrax, transmitted by breathing in anthrax bacteria or spores, is usually fatal.

Types of Anthrax Images
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Anthrax lesion on the skin of the forearm caused by the bacterium Bacillus anthracis.
This image shows cutaneous anthrax on the neck.
This image on eMedTV shows bacillus anthracis (the bacteria that cause anthrax) under a hih powered microscope.
This image on eMedTV is of a chest x-ray of a 46 year old male with pulmonary anthrax. This person worked in a goat hair processing mill. The x-ray shows pulmonary effusion on both sides, and a widened mediastinum, which are classic of pulmonary anthrax.
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What Are the Types of Anthrax?

Anthrax is a serious disease caused by the bacterium Bacillus anthracis. The three major types of anthrax are:
 

Cutaneous Anthrax

About 95 percent of anthrax infections are cutaneous anthrax. Transmission occurs when Bacillus anthracis enters a cut or abrasion on the skin, which can happen when handling contaminated wool, hides, leather, or hair products (especially goat hair) of infected animals.
 
A cutaneous anthrax skin infection begins as a raised, itchy bump that resembles an insect bite, but within one to two days develops into a blister. This blister then turns into a painless ulcer with a characteristic black necrotic (dying) area in the center (see Anthrax Pictures). Lymph glands in the adjacent area may swell, too.
 
About 20 percent of untreated cases of cutaneous anthrax will result in death. Deaths from this anthrax type are rare when appropriate treatment is received.
 

Inhalation Anthrax

Inhalation anthrax is caused by breathing in the anthrax bacteria or spores. Most of the time, this occurs by breathing in spores from infected animal products. It can also occur if anthrax was used as a biological weapon.
 
Initial anthrax symptoms may resemble a common cold. After several days, the symptoms may worsen to severe breathing problems and shock. This type of anthrax is usually fatal.
 
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Written by/reviewed by: Arthur Schoenstadt, MD
Last reviewed by: Arthur Schoenstadt, MD
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