Students of class IX had to present a seminar on ‘Dengue fever’. They wanted to introduce the disease by starting with :

Q. Students of class IX had to present a seminar on ‘Dengue fever’. They wanted to introduce the disease by starting with :
(a) Immediate causes of the diseases
(b) Definition of infectious diseases
(c) Pathogen causing dengue fever
(d) Vector responsible for dengue microbe
Can you help them to explain the above points ? Give details.
Ans. (a) Immediate cause is the main cause of disease through which virus disease has accumulated in the body. Dengue is the immediate cause of Dengue fever.
(b) Infectious diseases are those diseases in which microbes are immediate cause and spread from one person to another through means like air, water etc., e.g., chickenpox, cholera, etc.
(c) Pathogens causing dengue fever are microbes causing dengue fever, i.e., dengue virus.
(d) Vector responsible for dengue microbe is the female mosquito known as Anopheles. Female mosquito requires blood as meal as it is required for meeting their high protein requirement for laying eggs. When female mosquito stings a person for taking blood during this act virus is introduced into the blood of healthy person.

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