Introduction
Anthrax represents a serious infectious disease that can affect both humans and animals. The disease is caused by the Bacillus anthracis bacteria, which occurs naturally in soil worldwide. According to the Centers for Disease Control and Prevention (CDC), people typically contract anthrax through contact with infected animals or contaminated animal products. The disease manifests in different forms depending on how the bacteria enters the body, with symptoms ranging from skin lesions to severe respiratory and gastrointestinal complications. This article examines the nature of anthrax disease, its transmission methods, recommended prevention strategies, and treatment protocols based on current clinical guidelines.
Understanding Anthrax Disease
Anthrax is a serious disease usually caused by Bacillus anthracis bacteria. These bacteria are found naturally in soil around the world and commonly affect livestock and wild animals. The disease can manifest in different forms depending on how the bacteria enters the body:
Cutaneous anthrax: Occurs when anthrax enters through breaks in the skin, causing blisters or bumps on the skin, swelling around the sore, and a painless skin sore (ulcer) with a black center. These sores typically appear on the face, neck, arms, or hands.
Ingestion anthrax: Results from eating infected meat and can affect the upper part of the gastrointestinal tract, the lower part, or both. When affecting the upper GI tract, symptoms include swelling of the neck or neck glands, sore throat, and painful swallowing or difficulty breathing. Lower GI tract involvement may cause nausea and vomiting, stomach pain and swelling, and diarrhea. Patients may also appear flushed (red), have red eyes, or faint.
Inhalation anthrax: Occurs when people breathe in anthrax spores, causing shortness of breath, cough, chest discomfort, confusion, nausea or vomiting, stomachache, sweats, and dizziness.
Injection anthrax: Associated with injecting contaminated heroin, resulting in swelling at the injection site, nausea and vomiting, and sweats.
All types of anthrax can cause fever, chills, fatigue, and headache. If left untreated, anthrax can spread throughout the body and cause severe illness, including brain infections and death.
Transmission and Risk Factors
People usually get sick with anthrax through contact with infected animals or contaminated animal products such as wool, meat, or hides. The anthrax bacteria could also potentially be used as a biological weapon. Importantly, anthrax is not spread from person to person.
Livestock and wild animals can become infected when they breathe in, eat, or drink spores in contaminated soil, plants, or water. Animals commonly affected include cattle, sheep, goats, antelope, and deer.
While anthrax is rare in the United States, occasional outbreaks do occur in wild and domestic grazing animals such as cattle or deer. In regions where animals have had anthrax in the past, veterinarians recommend yearly vaccination of livestock.
Anthrax Prevention and Vaccination
Who Should Get Vaccinated
Anthrax vaccine is approved by the Food and Drug Administration (FDA) and recommended for certain high-risk groups:
Adults 18 through 65 years of age who are at risk of exposure to anthrax bacteria, including:
- Laboratory workers who handle Bacillus anthracis
- People who handle potentially infected animals or their carcasses
- Military personnel (as determined by the Department of Defense)
- Emergency responders whose activities might lead to exposure
Unvaccinated people of all ages who have been exposed to anthrax should receive 3 doses of anthrax vaccine together with recommended antibiotic drugs.
Vaccination Protocol
For individuals at ongoing risk of exposure, the recommended vaccination schedule consists of 3 doses of anthrax vaccine, followed by booster doses for continued protection. For those who have been exposed to anthrax, 3 doses of the vaccine should be administered together with antibiotic drugs.
Notably, anthrax vaccine has not been studied or used in children less than 18 years of age. For exposed children under 18, the vaccine must be used under an expanded access Investigational New Drug (IND) program and requires informed consent from a parent or legal guardian.
Contraindications and Precautions
Healthcare providers should be informed if the person receiving the vaccine:
- Has had an allergic reaction after a previous dose of anthrax vaccine, or has any severe, life-threatening allergies
- Is pregnant or thinks she might be pregnant
- Has a weakened immune system
- Has a history of anthrax disease
In some cases, healthcare providers may decide to postpone anthrax vaccination to a future visit. People with minor illnesses, such as a cold, may still be vaccinated. However, individuals who are moderately or severely ill should usually wait until they recover before getting the anthrax vaccine.
Treatment Options
Antibiotics
Antibiotics can be used for post-exposure prophylaxis (PEP) to prevent anthrax from developing in people who have been exposed but have not yet developed symptoms. All types of anthrax infection can be treated with antibiotics. Common antibiotics used to prevent and treat anthrax infection provide the same level of protection against the disease.
Anthrax spores typically take one to seven days to be activated, although some spores can remain dormant for up to 60 days or more before activation occurs. Therefore, PEP for anthrax includes 60 days of antibiotic treatment.
Antitoxin Treatment
Severe illness can occur if treatment is delayed because the patient was unaware of their exposure to anthrax. Once anthrax toxins are released in the body (when spores are activated), one possible treatment is anthrax antitoxin. Doctors must use antitoxin together with other treatment options, including antibiotics. Currently, there are a few types of antitoxins that can be used for treating anthrax.
Potential Vaccine Reactions
After receiving an anthrax vaccine shot, individuals may experience:
- Tenderness, redness, itching, or a lump or bruise at the injection site
- Muscle aches or short-term trouble moving the arm
- Headaches or fatigue
People sometimes faint after medical procedures, including vaccination. Individuals should inform their healthcare provider if they feel dizzy or experience vision changes or ringing in the ears.
As with any medication, there is a very remote chance of the vaccine causing a severe allergic reaction, other serious injury, or death.
Managing Serious Reactions
An allergic reaction could occur after the vaccinated person leaves the clinic. If signs of a severe allergic reaction appear—such as hives, swelling of the face and throat, difficulty breathing, a fast heartbeat, dizziness, or weakness—individuals should call 9-1-1 and seek immediate medical attention at the nearest hospital.
For other concerning signs, individuals should contact their healthcare provider. Adverse reactions should be reported to the Vaccine Adverse Event Reporting System (VAERS). Healthcare providers typically file this report, but individuals can also do it themselves by visiting the VAERS website or calling 1-800-822-7967.
Reporting and Public Health Considerations
Anthrax is a reportable disease in all U.S. states and territories. Healthcare providers are required to report suspected or confirmed cases to public health authorities. This reporting helps facilitate rapid public health responses and prevent further transmission.
Individuals who believe they may have been exposed to anthrax should contact a healthcare provider immediately. Early recognition and treatment are critical for preventing severe illness and death.
Conclusion
Anthrax represents a serious but rare infectious disease that can affect both humans and animals. The disease manifests in different forms depending on the route of exposure, with symptoms ranging from skin lesions to life-threatening respiratory and gastrointestinal complications. Prevention strategies include vaccination for high-risk individuals and post-exposure prophylaxis with antibiotics for those potentially exposed.
While the anthrax vaccine is an important tool for protecting at-risk populations, it is not without potential side effects. Healthcare providers must carefully evaluate patients for contraindications and monitor for adverse reactions. The vaccination protocol varies depending on whether the individual is at ongoing risk of exposure or has been exposed to anthrax.
Treatment of anthrax involves antibiotics, with a standard 60-day course recommended for post-exposure prophylaxis due to the potential for spores to remain dormant in the body. For severe cases where toxins have already been released, antitoxin treatment may be necessary alongside antibiotics.
Public health reporting requirements help ensure rapid identification and response to potential anthrax cases. Individuals who suspect exposure should seek medical attention immediately to ensure timely treatment and prevent complications.