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What is plague?
How does it spread?
What are the symptoms?
How is it diagnosed?
What is the treatment?
How can it be prevented?
Fri,17 Aug 2001 05:30:00 +0530
Written by : DoctorNDTV Team
Checked by :
  • What is plague?
    Fri,17 Aug 2001 05:30:00
    Plague is an infection caused by the bacterium Yersinia pestis. This organism is carried by rats and other rodents and spread by the bite of a flea (Xenopsylla cheopsis) or ingestion of the faeces of fleas through contaminated food.
  • How does it spread?
    Fri,17 Aug 2001 05:30:00
    Plague usually begins with the rat carrying the bacteria. When a flea feeds on the infected rat’s blood, this organism begins to multiply inside the body of the flea. The flea may also bite other organisms such as dogs and man. When it bites it regurgitates its contaminated blood onto its prey, where the plague-causing organism enters the new host’s body through the mouth or an exposed wound.

    Plague may also spread from one infected person to another, through droplets while coughing. An epidemic may start this way.
  • What are the symptoms?
    Fri,17 Aug 2001 05:30:00
    The symptoms vary with the type of the infection. There are three types of plague infection: Bubonic, Pneumonic and Septicaemic.

    Bubonic plague: In this case, the bacteria invade lymph nodes, which swell and are called ‘Buboes’. Blood vessels break, causing internal bleeding. This blood dries and the skin above it turns black hence it is called “Black Death”. Spread is slow from person to person, but the mortality rate is very high (upto 75%) in untreated cases. The signs of bubonic plague occur within 1-7 days of infection and include:
    • Sudden onset of high fever
    • Chills
    • General discomfort, uneasiness, or malaise
    • Muscular pains
    • Severe headache
    • Smooth, oval, reddened, painful swellings called buboes in the groin, armpits, neck, or elsewhere in the body
    • Swollen lymph glands
    • Seizures (fits)
    Pneumonic plague: The bacteria invade the lungs of the victim causing pneumonia. The lungs are filled with frothy bloody liquid. Other signs include:
    • Severe cough
    • Frothy, bloody sputum
    • Difficulty breathing
    • Chest pain
    Septicaemic plague results in sudden and intense shock without signs of infections.
  • How is it diagnosed?
    Fri,17 Aug 2001 05:30:00
    The doctor may suggest the following tests to diagnose plague:
    • Culture from the buboes
    • Sputum culture
    • Blood culture
    • Lymph node culture

  • What is the treatment?
    Fri,17 Aug 2001 05:30:00
    Plague can be effectively treated by giving antibiotics such as streptomycin, chloramphenicol, or tetracycline. Oxygen, intravenous fluids and respiratory support are additional treatments. Patients with pneumonic plague need to be isolated from other patients. People in contact with the patients of pneumonic plague are observed closely and may be given antibiotics as a preventive measure. Oral tetracycline is usually not prescribed for children whose permanent teeth have not erupted as it can permanently discolour teeth that are still forming.

  • How can it be prevented?
    Fri,17 Aug 2001 05:30:00
    Rat control and monitoring of the disease are the main measures used to control the risk of epidemics. A vaccination is available, but its effectiveness is not clearly established. Other preventive measures that should be adopted are:
    • Keep food in closed containers
    • Burn or bury garbage
    • Use insect repellents on the skin
    • Use Permethrin insecticide on clothing and bedding
    • Spray or dust insecticides on floors inside and outside home
    • Use traps or poison to kill rats
    • Do not handle sick or dead rodents

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