A20.0 Bubonic plague

Name of the Condition

• Bubonic plague

Summary

Bubonic plague is a bacterial infection caused by Yersinia pestis. It is the most common form of plague and is characterized by the sudden onset of fever, chills, and painful, swollen lymph nodes (buboes). The infection typically results from the bite of an infected flea or direct contact with infected animal tissues. Bubonic plague can progress to septicemic or pneumonic forms if left untreated, which may be fatal.

Causes

Bubonic plague is caused by the bacterium Yersinia pestis. Transmission occurs when infected fleas bite humans or when individuals handle infected animal carcasses, such as rodents or other wildlife. The bacteria enter the lymphatic system, leading to the formation of buboes.

Risk Factors

• Exposure to flea-infested rodents or their habitats.
• Living in or traveling to regions where plague is endemic, such as parts of Africa, Asia, and the Americas.
• Occupations involving wildlife handling, veterinary work, or outdoor activities in endemic areas.
• Close contact with animals or humans with plague.

Symptoms

• Sudden onset of fever, chills, and headache.
• Painful, swollen lymph nodes (buboes) in the groin, armpit, or neck.
• Fatigue and muscle aches.
• Nausea or vomiting in some cases.

Diagnosis

Bubonic plague is diagnosed through clinical evaluation and laboratory testing. A healthcare provider may perform a physical exam to identify buboes and order tests such as blood cultures, lymph node aspirates, or PCR to detect Yersinia pestis. Rapid diagnostic tests may be used in outbreak settings.

Treatment Options

• Antibiotics are the primary treatment, including streptomycin, gentamicin, or doxycycline.
• Supportive care to manage symptoms, such as pain relief and hydration.
• Early treatment is critical to prevent progression to more severe forms of plague.

Prognosis and Follow-Up

With prompt antibiotic treatment, the prognosis for bubonic plague is generally good. However, delays in care can lead to septicemic or pneumonic complications, which increase mortality risk. Follow-up care may include monitoring for recurrence or complications, especially if treatment was delayed.

Complications

• Septicemic plague, which can cause organ failure and tissue death.
• Pneumonic plague, a highly contagious form that affects the lungs.
• Meningitis or other systemic infections in severe cases.

Lifestyle & Prevention

• Avoid contact with wild rodents and their habitats.
• Use insect repellent and wear protective clothing in endemic areas.
• Practice good hygiene when handling animal carcasses.
• Seek prompt medical care if exposure to plague is suspected.

When to Seek Professional Help

Seek immediate medical attention if you experience sudden fever, chills, and painful lymph node swelling, especially after potential exposure to fleas or infected animals. Early treatment is essential to prevent severe complications.

Tips for Medical Coders

Document the presence of buboes, exposure history, and clinical findings to support the diagnosis. Ensure the code A20.0 is used for bubonic plague, and note any progression to other forms (e.g., septicemic or pneumonic) if applicable. Include details on diagnostic tests and treatment to justify coding accuracy.