INSIGHT UPSC QUIZ

Science & Technology General Science
Q.

Vectors are living organisms that can transmit infectious pathogens between humans, or from animals to humans. The commonest vectors we all know are mosquitoes. Which among the following vector borne diseases are caused by mosquitoes?

1. Yellow Fever

2. Lymphatic Filariasis

3. Zika Fever

4. Japanese Encephalitis

Select the correct answer using the code given below:

Explanation:

 ANSWER: (D) 

  • We live in an environment that is full of many other creatures apart from us. It is inevitable that many diseases will be transmitted by other animals. 
  • These animals carry the infecting agents from a sick person to another potential host. These animals are thus the intermediaries and are called vectors.
  • The commonest vectors we all know are mosquitoes. In many species of mosquitoes, the females need highly nutritious food in the form of blood in order to be able to lay mature eggs. 
  • Mosquitoes feed on many warm-blooded animals, including us. In this way, they can transfer diseases from person to person.
  • Malaria-causing microbes, entering through a mosquito bite, will go to the liver, and then to the red blood cells. The virus causing Japanese encephalitis, or brain fever, will similarly enter through a mosquito bite. But it goes on to infect the brain.

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