Anthrax

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What is anthrax?

Anthrax is a life-threatening infectious disease that normally affects animals, especially ruminants (such as goats, cattle, sheep, and horses). Anthrax can be transmitted to humans by contact with infected animals or their products. In recent years, anthrax has received a great deal of attention as it has become clear that the infection can also be spread by a bioterrorist attack or by biological warfare. Anthrax does not spread from person to person.

What causes anthrax?

The agent of anthrax is a bacterium called Bacillus anthracis. While other investigators discovered the anthrax bacillus, it was a German physician and scientist, Dr. Robert Koch, who proved that the anthrax bacterium was the cause of a disease that affected farm animals in his community. Under the microscope, the bacteria look like large rods. However, in the soil, where they live, anthrax organisms exist in a dormant form called spores. These spores are very hardy and difficult to destroy. The spores have been known to survive in the soil for as long as 48 years.

How is anthrax contracted?

Anthrax can infect humans in three ways. The most common is infection through the skin, which causes an ugly sore that usually goes away without treatment. Humans and animals can ingest anthrax from carcasses of dead animals that have been contaminated with anthrax. Ingestion of anthrax can cause serious, sometimes fatal disease. The most deadly form is inhalation anthrax. If the spores of anthrax are inhaled, they migrate to lymph glands in the chest where they proliferate, spread, and produce toxins that often cause death.



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Anthrax - Treatment Question: While rare, anthrax can be treated. Discuss what you'd do in the event of exposure to a biological weapon.
Anthrax - Concerns Question: Please discuss your concerns about anthrax or other agents used as biological weapons.
Anthrax - Prevention Question: Although the possibility of infection is rare, anthrax can be a source of fear, confusion, and uncertainty. Please share how you've discussed the threat with your family.
Learn about the deadliest outbreak of anthrax in recorded history.

Anthrax - From Russia with Love

Medical Author: Michael C. Fishbein, MD
Previous Medical Editor: Leslie J. Schoenfield, MD, PhD
Medical Editor: Melissa Conrad Stöppler, MD

This article recounts the chilling, yet fascinating story of the deadliest outbreak of anthrax in recorded history. Anthrax is a bacterium (germ) that can cause a serious, sometimes fatal infection. Anthrax can be used as a weapon. In 2001, anthrax was spread through the mail in a powder. Twenty-two people were infected. The events that occurred in Sverdlovsk, Russia, in 1979 demonstrate what can happen when anthrax is released into the air.

The Outbreak

This was the ninth day of the mysterious, fatal epidemicthat struck Sverdlovsk in early April of 1979. Autopsies already had been performed on 37 victims who died of an unknown disease. Yet neither the clinicians nor the pathologists had identified the cause of the epidemic. Moreover, as you can imagine, the members of the pathologydepartment were frustrated and overburdened with work. So, on this day, Dr. Faina Abramova, who had been chief of pathology at hospital #40, returned from retirement to help perform the autopsies.

The first autopsyDr. Abramova performed was number 38 of the 42 ultimately performed by the local pathologists. The patient was a 43-year-old man who had had weakness and feverfor two days. He was admitted to the hospital where he died four days later.

At the autopsy table, Dr. Abramova was struck by the crimson color of the membranes (meninges) covering the man's brain. In her description, she referred to this covering as the "cardinal's cap" because of its color and location. Astonishingly, she recognized this finding as characteristic of anthrax infection. (Few doctors have ever seen the disease anthrax.) In fact, her diagnosis was based on her recollection of a brain specimen from a patient with anthrax on display in a museum at her medical school.

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