Given a biological warfare agent casualty in a combat environment and standard field medical equipment and supplies, manage biological casualties to prevent further injury or death. (FMST-HSS-1413)
ENABLING LEARNING OBJECTIVES
Without the aid of references, given a description or title, identify the general groups of biological agents, per the student handout. (FMST-HSS-1413a)
Without the aid of reference, given a description or list, identify the characteristics of various biological agents, per the student handout. (FMST-HSS-1413b)
Without the aid of references, given a description or list, identify symptoms of exposure of various biological agents, per the student handout. (FMST-HSS-1413c)
Without the aid of references, given a description or list, identify treatments for various biological agents, per the student handout. (FMST-HSS-1413d)
Without the aid of references, given a description or list, identify the four (4) phases of defensive measures against biological agents, per the student handout. (FMST-HSS-1413e)
HISTORY OF BIOLOGICAL WARFARE:
At the end of World War II, the Imperial Japanese army initiated an aggressive research effort to produce an effective biological agent. The goal was to learn the medical effects of such agents and determine the different methods of delivery. The most recent indication of offensive biological warfare capability comes from Team Seven of the United Nations Special Commission, which conducted inspections of Iraqi biological warfare research and development. The Iraqi government announced that prior to Operation Desert Storm, research had been conducted into the use of Bacillus Anthracis, Botulinum toxins, and Clostridium perfringens.
Definition: The intentional use of living infectious microrganisms or toxins, derived from living organisms, to cause death or disease in humans, animals or plants.
Delivery may be in the form of sprays, explosive devices (i.e. cluster bombs, or warheads) and contaminated food /water supplies. The most common method is aerosolizing the agent in a spray (i.e crop dusting). Signs and symptoms of biological agents will initially mirror the signs and symptoms of naturally occurring diseases making exposure difficult to diagnose. Laboratory analysis is the only definate way to confirm biological agent exposure.
General Groups of Biological Agents
Bacteria - free living microorganisms that are naturally occurring or engineered. They work by overcoming the body's defense mechanism by invading cells. Most are killed by antibiotics.
Virus - an infectious agent, smaller than bacteria, that lacks independent metabolism and is able to replicate only within a host cell. Viruses produce diseases that do not respond to antibiotics. Supportive care is the only treatment.
Venezuelan Equine Encephallitis (VEE)
Viral Hemorragic Fever (VHF)
Biological Toxins - toxins are poisons which are produced by functions of microorganisms, plants and animals. Toxins do not grow or replicate, but have been classified biological agents by the United States due to their ability to be biochemically engineered.
Staphylococcal enterotoxin B
CHARACTERISTICS OF BIOLOGICAL AGENTS
Anthrax (Bacillus anthracis) - an acute bacterial infection of the skin, lungs or gastrointestinal tract. Anthrax is endemic worldwide. Anthrax was weaponized in 1950.
Causes of Anthrax
- Primarily a disease of herbivorous animals. Cattle, sheep and horses are the most common domesticated animal hosts.
- Cutaneous infection occurs when handling infected animal tissue, contaminated hair, wool, hides or products made from infected slaughtered animals.
- Respiratory infection results from inhaling anthrax spores.
- Intestinal infection results from ingesting infected meat.
Signs and Symptoms of Anthrax: Signs usually present within 48 hours. The incubation period for anthrax is hours to 7 days.
Cutaneous: On the Skin
- Begins as a papule followed by the formation of a fluid fillled vesicle
- Normally appears on hands and forearms first
- The vesicule typically dries and forms a coal-black scab. This scab is usually surrounded by mild to moderate edema (sometimes with small secondary vesicles).
- Pain is unusual, and if present, is caused by secondary infection.
Inhalation: In the Lungs
- Gradual and nonspecific onset of fever, malase, fatigue, nonproductive cough and mild chest discomfort.
- Initial symptoms are followed by a short perod of improvement (hours to 2-3 days)
- Abrupt onset of severe repiratory distress with dyspnea, diaphoresis, stridor and cyanosis.
- Septicemia, shock and death usually follow within 24-36 hours after onset of respiratory distress.
Gastrointestinal: In the Intestines
- Presents with severe sore throat or a local oral or tonsillar ulcer.
- Nonspecific symptoms of nausea, vomiting and fever.
- Followed by severe abdominal pain with hematemesis and diarrhea
Treatment for Anthrax:
- Ciprofloxacin 400mg IV every 8-12 hours or 500mg by mouth twice daily for four weeks.
- Employ standard precautions for handling, treating, and moving all active cases.
Prevention - prophylactic vaccination series
Plague - caused by the bacterium Yersinia pestis which naturally infects rodents in certain parts of the world. There are three main types of plague: Bubonic, Pneumonic and Septicemic.
Causes of Plague
- The primary mode of transmission is flea bites.
- A secondary source of infection is through aerosolized droplets of sputum from an infected person.
- Maintain standard precautions for bubonic plague patients and droplet precautions for pneumonic plague patients
- Streptomycin 30mg / kg / day IM in two divided doses for 10 -14 days
- Doxycycline 200mg IV then 100mg IV BID, until clinically improved then 100mg PO BID for a total of 10-14 days
- Vigorous fluid resuscitation
Prevention - prophylactic vaccination series
Smallpox - a systemic viral disease caused by the variola virus. Endemic smallpox was declared globally eradicated in 1980 by the World Health Organization (WHO). The only WHO-approved repositories of the variola virus are in the Centers for Disease Control and Prevention (CDC) in Atlanta, GA and in the CDC’s counterpart, Vector, in Koltsovo, Russia.
Causes of Smallpox
- Contact with infected respiratory discharge
- Contact with infectious bed linens or clothing of casualties
- Contact with drainage from wound
Signs and Symptoms of Smallpox
- Sudden onset of nonspecific symptoms:
Backache that lasts 2-3 days
- Two to three days after initial onset, a rash appears. It starts with face, hands and forearms, moves to the lower extremities and then to the trunk. Lesions will appear as minute macules, then papules, vesicles, pustules and finally scabs. Scabs form at 8 - 14 days and slough off at 14 - 28.
- Casualty is infectious throughout the entire term of the disease until the scab separates and falls off.
- All lesions occur simultaneously
Treatment for Smallpox
Quarantine the casualty and maintain strict sterile procedures.
Prevention of Smallpox
- Prophylaxis: Vaccination of vaccinia virus. Revaccination should be carried out every 10 years for personnel who are at risk of infection.
- There are no routine immunizations of US forces for smallpox. When the threat indicates, senior leadership may direct vaccination of personnel.
Botulism - a biological toxin caused by the bacterium Clostridium botulinum. It is the most toxic substance to man. Due to its incredible potency and relative ease of manufacture, botulism toxin is considered a likely threat. Botulism acts as a neurotoxin.
Causes of Botulism
Signs and Symptoms of Botulism
Dysphagia (difficulty swallowing)
Diplopia (seeing double)
Symmetrical flaccid paralysis (Loss of tone and reflexes)
IV and IM administration of trivalent botulinum antitoxin (ABE)
Ricin - a toxin made from the mash that is left over after processing Castor beans for oil. Castor bean processing is a worldwide activity; therefore, the raw materials for making ricin are readily available. The toxin may be either inhaled or ingested. Ricin acts directly on cells by inhibiting protein synthesis, which causes cellular death and tissue necrosis.
The key here is PRE, something you want to do BEFORE the attack! re-attack Phase of Biological Warfare
Train and inform personnel of possible agents.
Practice good sanitation and hygiene.
Ensure immunizations are up to date.
The key here is ATTACK, things that you would expect to see during an attack or what to do during the attack! Protect supplies and equipment.
Attack Phase of Biological Warfare
Signs of attack include
Aircraft spraying or dropping objects.
Lobbing of low blast shells or bombs
Smoke or mist of unknown origin
Dead animals with no visible cause
Rapid increase of patients at sick call
Defensive measures include:
Stop breathing and don protective mask.
Give the alarm.
Remain under cover, and move outside only after cloud has passed or "ALL CLEAR" is sounded.
Cover exposed skin.
Post-Attack Phase of Biological Warfare
CONTINUE to practice an increased level of good health, field sanitation and hygiene discipline. K
The key here is POST, things to do AFTER the attack! eep wounds, cuts, and scratches clean by using soap, water and utilize available first aid. Don't consume local foods.
Eat and drink only approved food and water.
Do not bathe in lakes, ponds and streams.
Do not touch animals, especially dead ones.
Observe BW contamination markers.
Designate an area for the decontamination station.
Establish and operate the station.
Provide personnel for monitoring teams.
Post NATO Biological Warning Markers.
Figure 1. NATO Biological Warning Marker
triangular shaped marker measuring 11" x 8" x 8" with blue background and red letters spelling "BIO". (See figure 1.)
Medical Management of Biological Casualties, July 2000
REV: July 2008
Biological Agents Review
1. List the signs and symptoms of inhalation anthrax.
When and where does the small pox rash develop?
Identify three facts about Botulism.
4. List three actions to avoid during the “Post-Attack” phase of biological warfare.