Regarding Yellow fever, choose the correct statements from the following.

1. Transmitted by Aedes.
2. Incubation period is 10-14 days.
3. It is caused by a Flavivirus.
4. Incidence increases with Humadity.

Choose the most appropriate answer from the options given below:

1. A

   Only 1, 3 and 4

2. B

   Only 1 and 2

3. C

   Only 3 and 4

4. D

   Only 1, 2 and 3

Appeared in: Raj. CHO -2024

Explanation

• Statement 1 is correct: Yellow fever is primarily transmitted in urban settings by the Aedes aegypti mosquito.
• Statement 3 is correct: The disease is caused by the Yellow fever virus, which is a member of the Flavivirus genus.
• Statement 4 is correct: High humidity (above 60%) is a key environmental factor that supports the mosquito vector's survival, thereby increasing the potential for disease transmission.
• Statement 2 is incorrect: The incubation period for yellow fever is 3 to 6 days, not 10-14 days.

Why Other Options Were Wrong

• Option B: This option incorrectly includes statement 2. The incubation period for yellow fever is 3-6 days, not 10-14 days.
• Option C: This option is incomplete as it omits the correct statement 1 (Transmitted by Aedes). While statements 3 and 4 are correct, statement 1 is also a correct and crucial fact about yellow fever.
• Option D: This option incorrectly includes statement 2. The incubation period for yellow fever is definitively 3-6 days, making statement 2 false.

Related Visual

• Visual 1: Diagram - The three transmission cycles of Yellow Fever (sylvatic/jungle, intermediate, and urban) to illustrate the different hosts and vectors involved.
• Visual 2: Map - A world map highlighting the endemic zones for Yellow Fever in Africa and South America, which are also known as the 'yellow fever belt'.
• Visual 3: Infographic - Key differences between Yellow Fever and Dengue Fever, as both are mosquito-borne flaviviruses with overlapping geographic distribution.

Clinical Relevance

• Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Etiology, epidemiology, and transmission dynamics of Yellow Fever as background academic context rather than a clinical decision trigger.
• For nurses, understanding the short incubation period (3-6 days) is critical for travel health advising and for identifying potential cases in patients returning from endemic areas.
• Patient education on vector control is a key nursing role. This includes advising on eliminating standing water (where Aedes breeds), using mosquito nets, and applying insect repellent.
• Vaccination is the single most important preventive measure. Nurses must be aware of the indications and contraindications for the 17D vaccine, especially for travelers, pregnant women, and immunocompromised individuals.

How to Approach the Question

• First, read the main question to identify the topic, which is Yellow Fever.
• Next, analyze each of the four numbered statements independently. Treat each one as a true/false question.
• Use your knowledge base or provided resources to verify the facts for each statement: the vector, incubation period, causative agent, and environmental factors.
• Mark each statement as 'Correct' or 'Incorrect'. In this case: 1-Correct, 2-Incorrect, 3-Correct, 4-Correct.
• Finally, review the given options (A, B, C, D) and select the one that accurately represents the combination of correct statements you identified (1, 3, and 4).

Concept Tested & Keywords

• Concept Tested: Etiology, epidemiology, and transmission dynamics of Yellow Fever.
• Stem keywords: Yellow fever, Aedes, Incubation period, Flavivirus, Humadity
• Lead-in keywords: correct statements

Question ID

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