How does it spread?
The potential of C burnetii as a biowarfare agent is related directly to its infectivity. It has been estimated that 110 pounds of dried C burnetii would produce the same number of casualties as similar amounts of anthrax or tularemia organisms.
Fever, cough, and pleuritic chest pain may occur as early as ten
days after exposure. Patients are not generally critically ill,
and the illness lasts from 2 days to 2 weeks.
Person-to-person transmission is rare.
Humans acquire the disease by inhaling particles contaminated with the organisms. The most common animal carriers are sheep, cattle and goats. Farmers and abattoir workers are at greatest risk occupationally.
Q fever has been transmitted from heavily contaminated unwashed laundry; therefore the laundry must be marked and managed as infectious material. Sputum and urine from patients should be autoclaved before disposal.
Q fever is not a clinically distinct illness and may resemble
a viral illness or other types of atypical pneumonia. The diagnosis
is confirmed by serum tests.
Tetracycline or doxycycline should be started 8-12 days after
exposure and continued for 5 days. This regimen has been shown
to prevent clinical disease.
Specifics on treatment can be found here
Decontamination is accomplished with soap and water or a 0.5% chlorine solution on personnel.
An inactivated whole cell unlicensed vaccine is effective in for
protection against exposure, but severe local reactions to this
vaccine may be seen in those who already possess immunity. Therefore,
an intradermal skin test is recommended to detect pre-sensitized
or immune individuals.
Even without treatment, most patients recover. The exception is
when chronic Q fever infection inflames the heart. Then the mortality
rate is 24% even when patients receive appropriate treatment.
USAMRIID's Medical Management of Biological Casualties Handbood; Fourth Edition February 2001; pages 9-10; http://usamriid.detrick.army.mil/education/bluebook/bluebook.pdf
Federation of American Scientists; http://www.fas.org/nuke/intro/bw/agent.htm
CBRNE - Biological Warfare Agents; http://www.emedicine.com/emerg/topic853.htm
Virtual Naval Hospital: Treatment of Biological Warfare Agent Casualties; http://www.vnh.org/FM8284/index.html
All contents © 2001 Stan and Holly Deyo. All rights reserved.
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How does it spread?