Which one of the following is not a bacterial disease?

$(a)$ Name a worm which is found in our small intestine.
$(b)$ Name the bacteria which can cause acne.
$(c)$ Which protozoan is responsible for sleeping sickness?
$(d)$ Which disease is caused by the protozoan Leishmania?

Akhilesh is having a headache and fever. He takes some pills to reduce the fever and headache before going to the doctor. What is this type of treatment called? How can we reduce the effects of the disease? What is the limitation of this type of treatment? What is the possible remedy for these diseases?

What is meant by a community? How is our personal health related to community issues? Explain in brief.

Why do some children fall ill more frequently than others living in the same locality?

$(a)$ Who discovered the first vaccine?
$(b)$ Name two viral diseases that can be prevented by using vaccines. What is immunity?