After observing dark patches with itching sensation on the skin of a student in a school hostel, the warden advises his roommates not to share towels, clothes and combs among themselves. Name the disease the student is suffering from and name the causative organisms.

What are the symptoms of common cold?

i) ____________________

ii) ____________________

Differentiate between the diseases-night blindness and colour blindness.

Name the vector host of the malarial parasite. Mention the species of malarial parasite which causes malignant and fatal malaria.

Name the tests done for the diagnosis and confirmation of AIDS.