Anthrax

Anthrax is a serious infectious illness caused by the microbe Bacillus anthracis. This microbe resides in soil.

Anthrax became widely known in 2001 when it was used as a biological weapon. Powdered anthrax spores were sent via letters in U.S. mail.

This anthrax attack resulted in five deaths and 17 illnesses, making it one of the worst biological attacks in the history of the United States.

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A skin infection caused by anthrax.

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Dr. Anirban Deep Banerjee

You can get anthrax through indirect or direct contact by touching, inhaling, or ingesting anthrax spores. Once anthrax spores get inside your body and activate, the bacteria multiply, spread, and produce toxins.

You can come into contact with anthrax through animals or biological weapons.

Animals

Humans can get anthrax through:

  • exposure to infected domestic or wild grazing animals
  • exposure to infected animal products, such as wool or hides
  • inhalation of spores, typically during the processing of contaminated animal products (inhalation anthrax)
  • consumption of undercooked meat from infected animals (gastrointestinal anthrax)

Biological weapons

Anthrax can be used as a biological weapon, but this is very rare. There hasn’t been an anthrax attack in the since 2001.

Despite the 2001 attack, anthrax is uncommon in the United States. It’s most often found in some farming areas in the following regions:

  • Central and South America
  • the Caribbean
  • southern Europe
  • Eastern Europe
  • sub-Saharan Africa
  • central and southwestern Asia

Anthrax illness is more common in farm animals than people. Humans have an increased risk of getting anthrax if they:

  • work with anthrax in a laboratory
  • work with livestock as a veterinarian (less likely in the United States)
  • handle animal skins from areas with a high risk of anthrax (not common in the United States)
  • handle grazing game animals
  • are in the military on duty in an area that carries a high risk of anthrax exposure

While anthrax can be transmitted to humans via contact with animals, it’s not spread through human-to-human contact.

The symptoms of anthrax exposure depend on the mode of contact.

Cutaneous (skin) contact

Cutaneous anthrax is anthrax contracted through contact with the skin.

If your skin comes into contact with anthrax, you may get a small, raised sore that’s itchy. It usually looks like an insect bite.

The sore quickly develops into a blister. It then becomes a skin ulcer with a black center. This doesn’t usually cause pain.

The symptoms typically develop within one to five days after exposure.

Inhalation

People who inhale anthrax usually develop symptoms within a week. But symptoms can develop as quickly as two days after exposure and up to 45 days after exposure.

The symptoms of inhalation anthrax include:

  • cold symptoms
  • sore throat
  • fever
  • achy muscles
  • cough
  • shortness of breath
  • fatigue
  • shaking
  • chills
  • vomiting

Ingestion

The symptoms of gastrointestinal anthrax usually develop within a week of exposure.

Symptoms of anthrax ingestion include:

  • fever
  • loss of appetite
  • nausea
  • severe stomach pain
  • swelling in the neck
  • bloody diarrhea

Tests used to diagnose anthrax include:

  • blood tests
  • skin tests
  • stool samples
  • spinal tap, a procedure that tests a small amount of the fluid that surrounds the brain and spinal cord
  • chest X-rays
  • CT scan
  • endoscopy, a test that uses a small tube with an attached camera to examine the esophagus or intestines

If your doctor detects anthrax in your body, the test results will be sent to a public health department laboratory for confirmation.

Treatment for anthrax depends if you’ve developed symptoms or not.

If you’re exposed to anthrax but you have no symptoms, your doctor will begin preventive treatment. Preventive treatment consists of antibiotics and the anthrax vaccine.

If you’ve been exposed to anthrax and have symptoms, your doctor will treat you with antibiotics for 60 to 100 days. Examples include ciprofloxacin (Cipro) or doxycycline (Doryx, Monodox).

Experimental treatments include an antitoxin therapy that eliminates the toxins caused by Bacillus anthracis infection as opposed to attacking the bacteria itself.

You can reduce your risk of anthrax by having the anthrax vaccine.

The only anthrax vaccine that’s approved by the FDA is the Biothrax vaccine.

When used as a preventive measure, it’s a five-dose vaccine series given over an 18-month period. When used after exposure to anthrax, it’s given as a three-dose vaccine series.

The anthrax vaccine isn’t typically available to the general public. It’s given to people who work in situations that put them at high risk of contact with anthrax, such as military personnel and scientists.

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