biologic agents of warfare
TRANSCRIPT
Biological Agents of Warfare
Categories
Prioritized by the CDCCategory A
– Higher potential for weaponizing– More history-based risk– Higher risk of transmission
Category BCategory C
BW Category A
Small pox* Anthrax* Plague* Botulism Tularemia Viral hemorrhagic
fever
Variola major Bacillus anthracis Yersinia pestis Clostridium botulinum
toxin Ebola,marburg, lassa
Small Pox Victim
Small Pox History
1754-67 British BW during French-Indian wars in North America. – Infected blankets intentionally given to American
Indians resulting in >50% mortality. 1977 WHO eradicated small pox 1978/80s stopped vaccinations in USA &
worldwide– Soviet Union secretly weaponized
WHO approved repositories of variola in CDC and Institute for Viral Preparations (Moscow)
Small Pox Vaccine Impact on Mortality
Never vaccinated Post exposure vax < 10 years ago 11-20 years ago >20 years ago
52% case fatality 29% 1.4% 7% 11%
Similar Conditions Confused with Small Pox
Varicella Scabies Erythema multiforme Herpes zoster/simplex Impetigo Drug reactions
(eruptions) Contact dermatitis
Case Contacts of case Contacts of contacts
Lesions progress from macules to papules to vesicles to pustules to crusting & finally separation of crusts
Anthrax
Bacillus anthracis lives in certain soilsHardy forms (spores) survive in soil or
objects for yearsAnimals are infected when they ingest
spores while grazing, breathe in spores or eat infected animals
Once inside the host the bacteria multipy
Anthrax Types & Symptoms
Cutaneous Intestinal Inhalation
– Most dangerous form, spreads quickly from lungs to bloodstream
Symptoms – Resemble Flu– Fever, sweating, labored breathing
Bioterrorism Threat
Easy to manufactureSmall amount can lead to widespread
danger, fear, disruption, destabilizing chaos and death.
October 2001 USA– Via US Mail to a tabloid publishing company
in Boca Raton, Florida & NBC studios, NY– Spore filled letters indirectly affected thousands
of people– 11 with inhalation, killing 5
Anthrax Post-exp prophylaxis
1991 Iraq acknowledged weaponizing wet anthrax
1995 Aum Shinrikyo terrorist group unsuccessfully attempted release in Tokyo subway before using sarin
Vax + cipro x 30 days Ciprofloxacin 60 days Doxycycline 60 days Amoxicillin 60 days
If symptoms Hospital IV and po meds
Anthrax Vaccine?
1880 development began in animals1930 live spore vax for livestockWWII work began on inactivated vax
against bacteria1970 licensed Anthrax Vaccine Adsorbed
– Primarily used to protect troops
Does is Work?
CDC Study of mill workers at risk for cutaneous anthrax
5 unvaccinated workers developed inhalation anthrax, 4 of whom died
None of the vaccinated workers became ill90% of vaccinated animals survive lethal
doses of inhalation anthrax www.anthrax.osd.mil/vaccine/project2.asp
Side Effects
Redness, pain, swelling, burning, itching at injection site
Lump forms under skin subsides in a few days
Serious adverse event 1 in 100,000Since 1940 vax lab workers followed- so far
no long term health problems have arisen
A Study in BlackAcute infection primarily in rats & rodents
who have been bitten by infected fleasTypes
– Bubonic plague (swollen lymph glands)– Pneumonic plague (respiratory distress)– Septicemic plague (severe, rapid systemic dz)
Spreads– Contact with infected fleas
• trapping & hunting animals• Rats living in close proximity to humans
Yersinia pestis (Plague)
Environmental Cycle: – Flea bite Bubonic Plague Septicemia
Pneumonic Plague Contagious Respiratory droplets Treatment:
– Infected in natural setting• Streptomycin or gentamycin
– Mass exposure• Doxycycline, ciprofloxacin, chloramphenicol
– Vaccine discontinued 1999
Plague as a Bioweapon
1346 Tartar army hurled infected corpses into Kaffa– Possible start of Europe’s “Black Death”
WWII Japanese army dropped plague infected fleas in China
Post war USA & USSR aerosolized plague
Plague in History
First Pandemic– Plague of Justinian 6th century- recurring
periodically every 200 yearsSecond Pandemic
– Black Death/Great Plague 14th-17th century-recurring every 17-25 yrs from 1348-1750
Third Pandemic – 19th-20th century (1890-1930)
Early TheoriesCorruption of atmosphere
– Move to country, block windows, use of homeopathic remedies
Will of God or astrological influences– Resulting in death & persecution of religious
and social minorities (Jews, prostitutes and homosexuals)
Contagion through the air– Isolation, quarantine, blindfolded (to keep the
spirit of the infected from entering your eyes)
Medieval Infection Control 1500 AD
The Plague Doctor Beaked Mask
– Filter air stuffed with herbs
– Feverfew, chamomile, hemp
– Glass over eyeholes– Precursor to gas mask
Stick in hand Cloak of sealed canvas Frighten spirits not
microbes