Eradication of smallpox has been possible due to the following facts except:

The insect considered to be the greatest mechanical carrier of diseases is . . . . . . .

Consider the following statements:
$I.$ People should get vaccinated to avoid infection.
$II.$ Vaccination is available against polio,cholera,typhoid,tuberculosis,and many other diseases.
$III.$ Eradication of vectors is necessary for diseases like malaria and filariasis.
$IV.$ Dengue and chikungunya are both spread by $Culex$ mosquitoes.
Which of the statements given above are correct?

Which of the following is an auto-immune disease that affects many people in our society?

Which of the following is not considered a parasite?

$NSEP$ stands for