(a) It is generally observed that the children who had suffered from chicken pox in their childhood may not contract the same disease in their adulthood. Explain giving reasons the basis of such an immunity in an individual. Nname this kind of community.
(b) What are interferons? Mention their role.
(a) First infection of chicken pox produce a primary response and antibodies are generated against chicken pox virus, subsequent evacutes with the same virus elicits highly intensified secondary response, due to the memory cells formed during the first encounter, active immunity.
(b) Proteins secreted by viral infected cells from viral infected cell which protect non infected cells from viral infection/ where - interferon is given to cancer patient (it activates immune system), destorys tumor.