Sylvatic plague

An infectious disease affecting wild rodents and transmitted to humans

Yersinia pestis, the bacterium responsible for sylvatic plague

Sylvatic plague is an infectious disease caused by the bacterium Yersinia pestis. It primarily affects wild rodent populations and can be transmitted to humans through flea bites or direct contact with infected animals. Sylvatic plague is considered a zoonotic disease, meaning it can be transmitted from animals to humans.

Epidemiology

Sylvatic plague is found in various parts of the world, particularly in rural and semi-rural areas where wild rodents are abundant. The disease is endemic in certain regions of Africa, Asia, and the Americas. In the United States, sylvatic plague is primarily found in the western states, where it affects species such as prairie dogs, ground squirrels, and other rodents.

Transmission

The primary mode of transmission of sylvatic plague is through the bite of infected fleas, which are vectors for the Yersinia pestis bacterium. Fleas become infected by feeding on the blood of an infected rodent. Humans can become infected through flea bites, handling infected animals, or inhaling respiratory droplets from infected animals.

Clinical Manifestations

In humans, sylvatic plague can present in several forms, including:

• Bubonic plague: Characterized by swollen and painful lymph nodes, called buboes, fever, chills, and weakness.
• Septicemic plague: Occurs when the infection spreads to the bloodstream, causing fever, chills, abdominal pain, and bleeding into the skin and other organs.
• Pneumonic plague: The most severe form, which occurs when the bacteria infect the lungs, leading to respiratory symptoms such as cough, chest pain, and difficulty breathing.

Diagnosis

Diagnosis of sylvatic plague is based on clinical symptoms, history of exposure, and laboratory tests. Laboratory confirmation involves isolating Yersinia pestis from blood, sputum, or lymph node aspirates. Serological tests can also detect antibodies against the bacterium.

Treatment

Early diagnosis and treatment are crucial for effective management of sylvatic plague. Antibiotics such as streptomycin, gentamicin, doxycycline, and ciprofloxacin are effective against Yersinia pestis. Supportive care, including fluid management and respiratory support, may be necessary in severe cases.

Prevention

Preventive measures include reducing exposure to wild rodents and their fleas, using insect repellent, and wearing protective clothing in endemic areas. Public health measures such as controlling rodent populations and educating communities about the risks of sylvatic plague are also important.

Related pages

• Plague (disease)
• Yersinia pestis
• Zoonosis
• Vector (epidemiology)