Topline

An outbreak of anthrax—a deadly bacterial disease feared as a potential bioweapon—among cattle and wildlife in Wyoming has killed dozens of animals, and health officials are urging people to take care as experts investigate what marks the first outbreak of its kind in the state in decades.

Key Facts

Does Anthrax Pose A Risk To Humans?

Though “human cases are rare,” Wyoming’s Game and Fish Department said “precautions are warranted” in light of the outbreak. To limit the risk of anthrax exposure, Wyoming officials advised hunters and the public to stay away from any dead cattle or wildlife they encounter, to avoid harvesting sick-looking animals and to avoid picking up any roadkill in the Elk Mountain area, as well as to wear gloves while field dressing or handling harvested animals. The agency also advised owners of dogs, horses and other pets to keep the animals away from any carcasses they might encounter and urged anyone encountering dead wildlife to take a note of its location and report the findings. Health experts and organizations recommend seeking medical attention if anthrax exposure is suspected and antibiotics can be given as a form of post-exposure prophylaxis, or PEP, to prevent anthrax from developing if symptoms haven’t developed.

Key Background

Anthrax is a zoonotic disease, meaning it can jump from animals to humans, and its discovery in both livestock and wildlife in Wyoming means there is a risk to humans. Human anthrax infections are relatively rare, especially in countries like the United States, but are serious and often rapidly fatal without prompt treatment with antibiotics. There are four types of anthrax—cutaneous, injection, inhalation and gastrointestinal—which occur when the bacteria enter through the skin, an injection, are breathed in or are eaten. More than 90% are cutaneous (skin) anthrax, which can happen after spores enter through cuts or grazes when handling infected animals or contaminated animal products like hides, wool or hair. It is considered the least dangerous form of anthrax and around a fifth of patients will still die without treatment. But almost all treated properly with antibiotics will survive with symptoms like itchy skin, blisters, sores and swelling appearing around the infection site around one to seven days after exposure. The antibiotics most commonly used to treat anthrax—ciprofloxacin and doxycycline—are readily available and widely used throughout medicine.

Tangent

While anthrax is an infectious disease, it is not contagious and does not spread between people or animals. Infections primarily occur in mammals—often wild and domestic herbivores like sheep, cows, goats and deer—as well as some bird species. It almost always arises following environmental exposure and the durable nature of the spores mean it is practically impossible to eliminate or control the threat of anthrax in a given area once it is established. These features, along with the ability to disperse it as an aerosol, also make anthrax an ideal candidate for biological warfare. It is well-documented that many countries have explored the possibility of weaponizing anthrax and while some have admitted developing weaponized strains, no country is known to have deployed any. Officials worry anthrax could be deployed by non-state actors like terrorist groups, such as through letter attacks, and the CDC says anthrax is “one of the biological agents most likely to be used” in a bioterrorist attack.

Surprising Fact

Experts appear to be discovering new ways anthrax can manifest in humans, though examples are exceedingly rare. Scientists and clinicians used to believe only cutaneous, inhalation and gastrointestinal anthrax were possible in humans, though they recently discovered a distinct form of anthrax among heroin-injecting drug users in northern Europe. Symptoms for injection anthrax are similar to cutaneous anthrax but can include an infection deep under the skin or in the muscle where the drug was injected, the CDC says, and it can spread faster through the body and be harder to recognize than the cutaneous form. The CDC also warns of another anthrax disease: welder’s anthrax. The agency said the “newly identified and rare disease… has been found in several people who are welders or metalworkers.” It can cause severe pneumonia and be fatal, the CDC said, urging welders or metalworkers who develop “fever and chills with sudden cough, chest pain, difficulty breathing, or coughing up blood, see a healthcare provider immediately.”

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Further Reading

ForbesWhat To Know About Anthrax As WHO Warns Of Growing Outbreaks In AfricaBy Robert Hart