Rabbit fever is a rare, ancient disease that once served as a biological weapon.
In short: Known as tularemia, this bacterial infection can be transmitted through tick bites, contaminated water, or even lawnmowers. While modern antibiotics have slashed mortality rates from 60% to under 4%, the pathogen’s high infectivity and rapid onset have historically made it a candidate for state-sponsored biological warfare programs.
Tularemia, caused by the bacterium Francisella tularensis, is a complex zoonotic disease that primarily infects rodents, rabbits, and hares. First identified in 1911 in Tulare County, California, the disease manifests in six clinical variants, with ulceroglandular being the most common. The bacterium is a facultative intracellular organism that evades the immune system by primarily infecting macrophages. Because it requires as few as 10 to 50 bacteria to cause infection, it is highly potent, leading to symptoms like fever, skin ulcers, and lymph node inflammation within three to five days.
The history of the disease is intertwined with both nature and conflict. Some historians believe the 14th-century BC Hittite plague was an early instance of biological warfare, potentially marking the first recorded use of a pathogen to repel invaders. In the 20th century, the United States, Soviet Union, and Japan all investigated the bacteria for military use. The U.S. program at Pine Bluff Arsenal, Arkansas, standardized the Schu S4 strain as 'Agent UL' for use in cluster munitions, valuing its ability to incapacitate enemy forces without the extreme persistence of anthrax. However, the agent's sensitivity to sunlight and degradation over time presented significant technical challenges for weaponization.
Today, tularemia is considered rare in the United States, with incidence rates dropping to less than one per million between 1990 and 2000. While natural outbreaks still occur—often linked to wildlife contact, tick bites, or even aerosolized bacteria released during lawn mowing—the disease is effectively managed with antibiotics like streptomycin and gentamicin. Despite this, the pathogen remains a subject of intense scrutiny by public health agencies like the CDC, both for its potential as a bioterrorism agent and because of the ongoing need for a safe, approved vaccine to protect those at high risk, such as hunters and laboratory personnel.
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- Summary by Intellect · source: Tularemia
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