How is KFD disease spread?

Appeared in: UP CHO - 2018

Explanation

Kyasanur Forest Disease (KFD) is a vector-borne disease transmitted to humans primarily through the bite of infected hard ticks, specifically Haemaphysalis spinigera.
While the disease is also known as 'Monkey Fever,' monkeys are not the primary mode of transmission to humans. They act as amplifying hosts, meaning the virus multiplies significantly in them.
The death of monkeys in a forest area often signals a KFD outbreak, but the virus is carried from the monkey population to humans by the tick vector.
Humans can also contract the infection through direct contact with an infected and dead monkey, but tick bites are the main route.

Option A: Monkeys are amplifying hosts for the KFD virus, not the primary vector for transmission to humans. Their deaths indicate an outbreak, but the disease is spread by ticks.
Option C: Sand flies are vectors for other diseases, most notably Leishmaniasis (Kala-azar), not KFD.
Option D: Mosquitoes are vectors for numerous viral and parasitic diseases like Dengue, Malaria, and Chikungunya, but they do not transmit the KFD virus.

Clinical Relevance

Nursing practice connection: Knowing Transmission of Kyasanur Forest Disease (KFD) helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses in endemic areas (like parts of Karnataka, India) must be vigilant in identifying potential KFD cases, which present with high fever, headache, and hemorrhagic symptoms.
Patient education on preventive measures is a key nursing role. This includes advising on wearing protective clothing, using insect repellents (like DEET), and checking for ticks after visiting forested areas.
Community health nurses play a vital role in surveillance, including educating the public to report unusual monkey deaths to health authorities, which serves as an early warning system for potential outbreaks.

How to Approach the Question

First, identify the core of the question: it asks for the mode of transmission for 'KFD disease'.
Recall or recognize that KFD is also known as 'Monkey Fever'. This nickname can be a distractor. Think critically: does the name of a disease always indicate its direct mode of transmission?
Evaluate the options. All are potential disease vectors or hosts. Consider the specific disease, KFD.
Differentiate between a disease vector (an organism that transmits a pathogen) and a reservoir or amplifying host (an organism where the pathogen lives and multiplies). Monkeys are hosts, but ticks are the vectors that transmit it to humans.
Select the option that represents the primary vector responsible for spreading the disease to humans.

Concept Tested & Keywords

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart B (pp 202-403 of 604) p. 151-153

Practise the full UP CHO - 2018

Attempt every question from this paper in a timed mock, then review the full solution for each one.