Experience the Quality With Free NAVLE Exam Questions That Helps Candidates Pass

Strangles is caused by Streptococcus equi subsp. equi and presents with fever, nasal discharge, and lymph node abscessation/rupture. Influenza causes fever and cough but not lymphadenitis. EHV causes respiratory disease and abortion. Guttural pouch mycosis causes epistaxis, not purulent discharge. NAVLE stresses differential diagnosis of equine respiratory diseases and biosecurity.

Rhodococcus equi is a facultative intracellular bacterium causing chronic suppurative bronchopneumonia in foals, often with pulmonary abscesses. Extra-pulmonary manifestations include diarrhea (due to intestinal abscessation) and weight loss. Hepatic encephalopathy, seizures, or laminitis are not characteristic. NAVLE requires recognition of species-specific pathogens, zoonotic potential, and herd health management. Treatment involves prolonged macrolide (clarithromycin, azithromycin) with rifampin therapy, good ventilation, and biosecurity measures. Early detection improves survival.

Potomac horse fever causes acute watery diarrhea, leukopenia, and hypoproteinemia. It is transmitted by ingestion of aquatic insects infected with Neorickettsia risticii. Salmonella and Clostridium difficile also cause diarrhea but are not specifically associated with leukopenia and seasonal outbreaks. Lawsonia primarily affects foals. NAVLE emphasizes disease ecology, seasonal recognition, and prevention with vaccination and insect control.

Histomoniasis (blackhead disease) is caused by Histomonas meleagridis, transmitted by Heterakis gallinarum eggs. It produces cecal cores and pathognomonic “bullseye” hepatic lesions in turkeys. Avian influenza and Newcastle are viral systemic diseases, not associated with cecal cores. Marek’s causes tumors, not necrotic liver lesions. NAVLE emphasizes parasitology, vector control, and flock management.

Newcastle disease causes hemorrhagic lesions in the proventriculus and ceca, along with high mortality. Infectious bursal disease damages lymphoid tissue but does not cause proventricular hemorrhage. Marek’s causes tumors and immunosuppression. Avian influenza causes systemic hemorrhage but not pathognomonic cecal hemorrhage. NAVLE emphasizes recognition of reportable poultry diseases, biosecurity, and population medicine.