Which of the following statements about Dengue fever is correct?

1. It is the most commonly found arboviral infection.
2. Its incidence has been decreasing in India over the last 2-3 decades.
3. It can occur in both epidemic and endemic forms.
4. It survives at ambient temperature.

Choose the most appropriate answer from the options given below:

1. A

   Only 2, 3 and 4

2. B

   Only 1

3. C

   Only 1 and 2

4. D

   Only 1, 3 and 4

Appeared in: Raj. CHO -2024

Explanation

• Dengue is the most common arboviral infection prevalent in India and worldwide, making statement 1 correct.
• The incidence of Dengue has significantly increased in India over the past decades due to factors like urbanization, making statement 2 incorrect.
• Dengue is known to be endemic in many regions, including most of India, while also causing large seasonal epidemics, making statement 3 correct.
• The mosquito vector for Dengue, Aedes aegypti, thrives at ambient temperatures (16-30°C), which is essential for the survival and transmission of the virus, making statement 4 correct.
• Therefore, the combination of correct statements is 1, 3, and 4.

Why Other Options Were Wrong

• Option A: This option includes statement 2, which is factually incorrect. The incidence of Dengue in India has been increasing, not decreasing.
• Option B: This option is incomplete. While statement 1 is correct, statements 3 and 4 are also correct descriptions of Dengue fever.
• Option C: This option includes statement 2, which is incorrect. The incidence of Dengue has risen, not fallen.

Related Visual

• Visual 1: Infographic: World map showing the global distribution of Dengue fever, highlighting endemic and high-risk areas.
• Visual 2: Chart: Line graph showing the increasing trend of Dengue cases in India over the last 20 years.
• Visual 3: Diagram: The life cycle of the Aedes aegypti mosquito, showing breeding sites in and around homes.

Clinical Relevance

• Nursing practice connection: Knowing Epidemiology and characteristics of Dengue fever helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
• Nurses must be able to identify the signs of Dengue (high fever, headache, myalgia) and differentiate it from other febrile illnesses.
• Patient education is a key nursing role, focusing on preventing mosquito bites and eliminating breeding sites (e.g., stagnant water in containers).
• Nurses monitor for warning signs of severe Dengue (DHF/DSS), such as persistent vomiting, severe abdominal pain, and signs of bleeding, which require immediate escalation and intensive management.

How to Approach the Question

• First, read the question carefully to understand that you need to identify all the correct statements about Dengue fever.
• Evaluate each of the four statements individually based on your knowledge of communicable diseases.
• Statement 1: Recall the prevalence of different arboviral diseases. Dengue is known to be extremely common.
• Statement 2: Consider recent public health trends. Vector-borne diseases like Dengue have generally been on the rise with urbanization and climate change.
• Statement 3: Think about the disease pattern. Dengue is known for being constantly present in some areas (endemic) and causing large outbreaks (epidemics).
• Statement 4: Consider the biology of the virus and its vector. The mosquito vector's survival is directly tied to environmental temperature.

Concept Tested & Keywords

• Concept Tested: Epidemiology and characteristics of Dengue fever.
• Stem keywords: Dengue fever, arboviral infection, incidence in India, epidemic, endemic
• Lead-in keywords: Which of the following statements, is correct

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