Question

The disease caused by protozoan and spread by an insect:
(a) Dengue
(b) Malaria
(c) Polio
(d) Measles

Answer 1

Hint: Many protozoans cause various diseases which are spread by insects such as mosquitoes, cockroaches, etc. that act as a vector.

Complete answer:
Malaria is caused by Plasmodium species, which is a group of protozoans and spread via female Anopheles mosquitoes bite.
Dengue: Dengue is caused by either of the four types of dengue virus named DEN-1, DEN-2, DEN-3, and DEN-4. The virus can be spread to humans through the bites of infected mosquitoes.
Malaria: Malaria is caused by any one of five species of Plasmodium spread by Anopheles mosquitoes that survive in and near human residences. When a mosquito bites a person infected with a malarial protozoan, the protozoan enters the mosquito. When the infected mosquito then bites another person, the protozoan enters that person's bloodstream.
Polio: Polio is caused by the poliovirus. The virus invades the body through the mouth. It is spread through contact with the feces of an infected person or through airborne droplets from a cough or sneezes from an infected person coughs or sneezes.
Measles: Measles is caused by morbillivirus, which is often seen in the winter and spring. It's spread from direct contact with discharge from the nose and throat. Sometimes, it is spread through exposure to phlegm or mucus when an infected child.
So, the correct answer is “Malaria”.

Note:The severity of malaria differs based on the species of Plasmodium that has been transmitted. Symptoms are chills, fever, and sweating which occur in a cycle usually a few weeks after being bitten by the mosquito. Treatment of malaria includes antimalarial drugs.