NAVLE Veterinary Public Health 5 — Questions and Answers
Question 1: Which disinfection method is considered most effective for inactivating Cryptosporidium parvum oocysts in drinking water?
- Chlorination at standard doses
- UV irradiation (Correct answer)
- Ozonation at low concentrations
- Filtration alone without disinfection
Correct answer: UV irradiation
Cryptosporidium oocysts are highly resistant to chlorine; UV irradiation effectively inactivates them by damaging their DNA.
Question 2: An outbreak of West Nile Virus neurological disease is detected in horses in a county. What is the primary public health concern for veterinarians to communicate?
- Horses can directly transmit the virus to humans through contact
- Infected horses serve as sentinel animals indicating high mosquito transmission activity in the area (Correct answer)
- Horse vaccination will reduce human infection rates
- Culling infected horses will eliminate the outbreak
Correct answer: Infected horses serve as sentinel animals indicating high mosquito transmission activity in the area
Horses are dead-end hosts and cannot transmit WNV to humans, but equine cases signal active arboviral transmission by mosquitoes in the area.
Question 3: Which federal regulation requires interstate shipment of livestock to be accompanied by a Certificate of Veterinary Inspection (CVI)?
- Animal Welfare Act
- Animal Health Protection Act (Correct answer)
- Federal Meat Inspection Act
- Virus-Serum-Toxin Act
Correct answer: Animal Health Protection Act
The Animal Health Protection Act authorizes USDA APHIS to regulate interstate movement of animals, requiring CVIs for most livestock shipments.
Question 4: A food inspector observes condensation dripping from overhead pipes onto exposed ready-to-eat food contact surfaces. This represents a violation of which food safety principle?
- Temperature control for safety
- Sanitation and hygienic design (environmental sanitation) (Correct answer)
- Supplier verification
- Allergen labeling requirements
Correct answer: Sanitation and hygienic design (environmental sanitation)
Condensation dripping onto food contact surfaces represents an environmental sanitation and hygienic facility design failure, a prerequisite program violation.
Question 5: Botulism outbreaks associated with commercially processed foods typically involve which form of Clostridium botulinum toxin production?
- Wound botulism from contaminated soil
- Preformed toxin ingestion from improperly processed low-acid canned foods (Correct answer)
- Intestinal toxicoinfection in infants consuming spores
- Iatrogenic botulism from therapeutic injections
Correct answer: Preformed toxin ingestion from improperly processed low-acid canned foods
Foodborne botulism typically results from ingestion of preformed toxin in low-acid, anaerobic environments created by improper canning processes.
Question 6: Which principle of disease prevention is represented by routine vaccination of dogs against rabies in the US?
- Tertiary prevention
- Secondary prevention through early detection
- Primary prevention by reducing exposure and susceptibility (Correct answer)
- Quaternary prevention
Correct answer: Primary prevention by reducing exposure and susceptibility
Routine rabies vaccination is a primary prevention strategy that reduces the reservoir of infection and prevents the disease from occurring.
Question 7: Under the National Incident Management System (NIMS), which position within the Incident Command System (ICS) coordinates animal care activities during a disaster response?
- Safety Officer
- Animal/Technical Specialist or Veterinary Medical Officer (Correct answer)
- Logistics Section Chief
- Public Information Officer
Correct answer: Animal/Technical Specialist or Veterinary Medical Officer
Veterinary Medical Officers or Animal Technical Specialists serve within ICS to coordinate animal care, biosecurity, and zoonotic disease control during disasters.
NAVLE Veterinary Public Health 5
Which disinfection method is considered most effective for inactivating Cryptosporidium parvum oocysts in drinking water?