$(a)$ Which part of the body is infected by the malaria-causing microbe?
$(b)$ What are the two ways to treat an infectious disease?

Give one local and one general effect of the inflammation process.

What do you mean by active and passive immunisation?

About a hundred years ago,when smallpox persisted,a group of people who had this disease earlier and had survived it had no chance of suffering from it again. So,having the disease once was a means of preventing subsequent attacks of the same disease.
$(a)$ Why does this happen? Explain.
$(b)$ We can 'fool' the immune system. Clarify.
$(c)$ Name this principle of prevention of diseases.

Why are antibiotics not effective for viral diseases?

$A$ doctor,nurse,or health worker is exposed to more sick people than others in the community. Find out how they avoid getting sick themselves.