Anthrax is a bacterial disease caused by Bacillus (B.) anthracis. In humans, three types of anthrax infections can occur based on the route of exposure.

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Anthrax Characteristics



Transmittal & Characteristics




The most common, naturally occurring anthrax infection. May be transmitted via skin contact with contaminated meat, wool, hides, or leather from infected animals. Incubation is from 1 to 12 days. Infection occurs through scratches or skin abrasions.

Infection appears as a raised bump resembling a spider bite. Within 1 to 2 days, it develops into a blister and then a painless ulcer, with a black necrotic (dying) area in the center. The lesion may cause fever, malaise, and headache. Lymph glands in the area may swell.



Anthrax spores must be aerosolized to cause inhalational anthrax. It is contracted by inhaling spores and occurs in workers handling infected animal hides, wool, and fur. The number of spores that cause infection is unknown. Incubation period is unclear, but may range from 1 to 7 days or up to 60 days.

Inhalation anthrax resembles a viral respiratory illness. Initial symptoms include sore throat, mild fever, muscle aches, and malaise. Symptoms may progress to respiratory failure and shock with meningitis. After incubation of 1 to 7 days, the onset of inhalation anthrax is gradual.



Gastrointestinal anthrax usually follows consumption of raw or undercooked contaminated meat and has an incubation period of 1 to 7 days.

Causes acute inflammation of the intestinal tract. Initial signs are nausea, loss of appetite, vomiting, fever followed by abdominal pain, vomiting of blood, and severe diarrhea.