The Question is from neet-zoology , and it was created by the author K SUNKANNA

Question

A poultry farmer observes a sudden drop in egg production in his flock accompanied by ruffled feathers, watery diarrhea, and respiratory distress. Which of the following diseases is the MOST likely cause, considering its high mortality and rapid spread?

K SUNKANNA · Accepted Answer

## CORE INFORMATION
✓ **Answer**: 2 (Ranikhet disease)
## CONCEPT FRAMEWORK
 **Primary Concept**: Avian Diseases and their Symptoms
 **Related Topics**: Poultry health, epidemiology, viral diseases
 **Prerequisites**: Basic knowledge of common poultry diseases and their clinical presentation.
## SOLUTION PATHWAY
**Given Information**:
Sudden drop in egg production, ruffled feathers, watery diarrhea, respiratory distress, high mortality, rapid spread.
**Method & Steps**:
1. Analyze the symptoms:
  Reasoning: The combination of symptoms points towards a highly contagious and fatal avian disease.
  Formula/Rule: None directly applicable, but understanding of clinical signs is crucial.
2. Consider the options:
  Working: Let's examine each option for its typical presentation and severity:
		* Avian Influenza: Highly variable in symptoms; can range from mild to severe respiratory disease. High mortality is possible, but not always the case. Rapid spread depends on the strain.
		* Ranikhet Disease (Newcastle Disease): Characterized by respiratory distress, nervous signs (ruffled feathers), enteric signs (diarrhea), and high mortality. It spreads rapidly through the flock.
		* Infectious Coryza: Primarily affects the respiratory system, causing sneezing, nasal discharge, and swelling of the face. Mortality is typically low.
		* Fowl Cholera: Can cause sudden death, but symptoms can vary widely, including respiratory signs, diarrhea, and swelling. Spread can be rapid, but mortality is not always extremely high.
 3. Identify the best match:
  Result: Ranikhet disease best fits the description of sudden onset, high mortality, rapid spread, and the combination of respiratory, nervous, and digestive symptoms.
  Verification: The symptoms provided strongly suggest a highly contagious and fatal disease, aligning perfectly with the typical characteristics of Ranikhet disease.
 ## OPTION ANALYSIS
A :x: Avian influenza can cause high mortality and rapid spread, but the symptom profile is not as consistently aligned with the question's description.  It is less consistently associated with the combination of respiratory, nervous, and digestive symptoms described.
B ✓: Ranikhet disease (Newcastle disease) is known for its high mortality rate, rapid spread, and the combination of respiratory, nervous (ruffled feathers), and digestive (watery diarrhea) symptoms described in the question.
C :x: Infectious coryza primarily affects the respiratory tract and is not typically associated with high mortality or the nervous and digestive symptoms described.
D :x: Fowl cholera can cause high mortality, but its symptoms are more variable and don't always include the combination of respiratory, nervous, and digestive symptoms mentioned in the question.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Overlooking the severity and speed of spread: Focusing solely on individual symptoms without considering the overall disease picture can lead to incorrect conclusions.
  2.Assuming one symptom defines the disease:  Avian diseases often present with multiple symptoms, requiring a holistic assessment.
 **Quick Tips**:
  1.Prioritize high-mortality, rapidly spreading diseases when dealing with sudden outbreaks in poultry.
  2.Memorize the key clinical signs of common poultry diseases to aid in differential diagnosis.

K SUNKANNA · Answer

Avian influenza

K SUNKANNA · Answer

The correct Option is "Ranikhet disease"

K SUNKANNA · Answer

Infectious coryza

K SUNKANNA · Answer

Fowl cholera

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