Overview
This lecture covers disasters caused by biological agents, focusing on bioterrorism pathogens, their CDC classifications, clinical features, isolation protocols, and emergency nursing interventions.
CDC Classification of Biological Agents
- Category A: Most deadly and infectious; high mortality and public panic (e.g., Anthrax, Botulism, Plague, Smallpox, Tularemia, Hemorrhagic fevers).
- Category B: Moderate morbidity and lower mortality; less infectious (e.g., Brucellosis, Q fever, Ricin toxin).
- Category C: Emerging threats with future potential (e.g., Nipah fever, Hantavirus).
Anthrax (Bacillus anthracis)
- Zoonotic disease from infected animals; extremely resilient spore-former.
- Three forms: inhalation (most serious), cutaneous (skin ulcers with black eschar), gastrointestinal (oral/GI ulcers, sepsis).
- Universal and contact precautions; AVA vaccine; post-exposure prophylaxis with ciprofloxacin or doxycycline for 60-100 days.
- Treatment: Cutaneous—oral antibiotics; Inhalation—IV antibiotics plus multidrug regimen, possible chest tube for effusions.
Botulism (Clostridium botulinum)
- Produces potent neurotoxin; causes paralysis and respiratory failure.
- Four types: foodborne, infantile, wound, intestinal.
- Blocks acetylcholine release, leading to descending, symmetric paralysis.
- Universal precautions, droplet precautions; antitoxin for lab personnel.
- Treatment: Ventilatory support, early antitoxin, cathartics/enemas, immune globulin for infants.
Plague (Yersinia pestis)
- Historically deadly; transmitted by flea bites or droplets.
- Three forms: Bubonic (swollen lymph nodes), Septicemic (sepsis, gangrene), Pneumonic (lung infection, severe pneumonia).
- Strict isolation, PPE for healthcare workers; antibiotic prophylaxis for contacts.
- Treatment: Streptomycin, gentamicin, doxycycline, ciprofloxacin, or chloramphenicol.
Key Terms & Definitions
- Bioterrorism — Use of biological agents to cause harm or panic.
- Category A/B/C Agents — CDC classification of biological threats by severity and risk.
- Anthrax — Deadly infection by Bacillus anthracis, often from animals.
- Botulism — Paralytic illness from Clostridium botulinum toxin.
- Plague — Severe infection by Yersinia pestis; forms include bubonic, septicemic, and pneumonic.
- Isolation Precautions — Protective measures to prevent disease spread.
Action Items / Next Steps
- Review main pathogens in CDC categories A, B, and C.
- Memorize anthrax, botulism, and plague forms, symptoms, and treatments.
- Complete the quiz activity and rationalize your answers within 10 minutes.