3 Nov 2009 : What’s Pneumonic Plague?

[Watchman]

What’s Pneumonic Plague?



This patient presented with symptoms of plague that included gangrene of the right hand causing necrosis of the fingers. In this case, the presence of systemically disseminated plague bacteria Y. pestis, i.e. septicemia, predisposed this patient to abnormal coagulation within the blood vessels of his fingers. Photo: CDC 1975. Caption: CDC/ CDC/Dr. Jack Poland

Pneumonic plague is one of several forms of plague. Depending on circumstances, these forms may occur separately or in combination:
Pneumonic plague occurs when Y. pestis infects the lungs. This type of plague can spread from person to person through the air. Transmission can take place if someone breathes in aerosolized bacteria, which could happen in a bioterrorist attack. Pneumonic plague is also spread by breathing in Y. pestis suspended in respiratory droplets from a person (or animal) with pneumonic plague. Becoming infected in this way usually requires direct and close contact with the ill person or animal. Pneumonic plague may also occur if a person with bubonic or septicemic plague is untreated and the bacteria spread to the lungs.
Bubonic plague is the most common form of plague. This occurs when an infected flea bites a person or when materials contaminated with Y. pestis enter through a break in a person’s skin. Patients develop swollen, tender lymph glands (called buboes) and fever, headache, chills, and weakness. Bubonic plague does not spread from person to person.
Septicemic plague occurs when plague bacteria multiply in the blood. It can be a complication of pneumonic or bubonic plague or it can occur by itself. When it occurs alone, it is caused in the same ways as bubonic plague; however, buboes do not develop. Patients have fever, chills, prostration, abdominal pain, shock, and bleeding into skin and other organs. Septicemic plague does not spread from person to person.



Symptoms and Treatment

This patient presented with symptoms of plague that included gangrene of the right foot causing necrosis of the toes. In this case, the presence of systemically disseminated plague bacteria Y. pestis, i.e. septicemia, predisposed this patient to abnormal coagulation within the blood vessels of his toes. Photo CDC. Caption: CDC/William Archibald

With pneumonic plague, the first signs of illness are fever, headache, weakness, and rapidly developing pneumonia with shortness of breath, chest pain, cough, and sometimes bloody or watery sputum. The pneumonia progresses for 2 to 4 days and may cause respiratory failure and shock. Without early treatment, patients may die.

Early treatment of pneumonic plague is essential. To reduce the chance of death, antibiotics must be given within 24 hours of first symptoms. Streptomycin, gentamicin, the tetracyclines, and chloramphenicol are all effective against pneumonic plague.

Antibiotic treatment for 7 days will protect people who have had direct, close contact with infected patients. Wearing a close-fitting surgical mask also protects against infection.

A plague vaccine is not currently available for use in the United States.



During the 1975 Rhodesian, (now Zimbabwe), Marburg epidemiologic investigation, health officials came across this African farmer with an inguinal bubo. Photo: CDC 1975. Caption: CDC/ Dr. J. Lyle Conrad

The epidemiologists uncovered an outbreak of plague amongst the local farmers, and treated these patients with oral antibiotics. Sanitarians were quickly dispatched to spray huts for fleas, and then trap rats carrying the pathogenic agent, Yersinia pestis bacterium.
Plague: Prevention & Control
From the CDC Plague Home Page, provided by the Division of Vector-Borne Infectious Diseases, NCID, CDC
Community-Based Mass Prophylaxis: A Planning Guide for Public Health Preparedness
Planning guide to help state, county, & local officials meet federal requirements to prepare for public health emergencies. Outlines five components of mass prophylaxis response to epidemic outbreaks. Addresses dispensing operations using a comprehensive operational structure for Dispensing/Vaccination Centers (DVCs) based on the National Incident Management System (NIMS). (Developed by Weill Medical College of Cornell University for the Agency of Healthcare Research & Quality [AHRQ].)
Recognition of Illness Associated with the Intentional Release of a Biologic Agent (PDF 168 KB/20 pages)
Bioterrorism Readiness Plan: A Template for Healthcare Facilities (PDF 1.5 MB/34 pages) See Section II: Agent-Specific Recommendations, Plague; pages 19-25.