Recognition of an antigenic protein of a pathogen or exposure to a pathogen occurs during many types of immune responses, including active immunity and induced active immunity.
Specify the types of responses elicited when human beings get encountered by a pathogen.

Name and explain the two types of immune responses in humans.

When the same antigen or pathogen enters for a second time in human body, the resultant secondary immune response is stronger than primary immune response due to

Antigen antibody reaction || primary and secondary immune response || active and passive immunity || vaccination || autoimmune allergic and immune dficiency diseases || grafting and transplantation

A patient had tested positive to ELISA Test. Identify the disease and the pathogen responsible, give reasons for the reduced/ weak immunity of the patient and trace the path, spread and effects of this pathogen in the human body.

Read the following statements and select the correct ones. (i) Vaccine is a preparation (or suspension ) of a dead/attenuated pathogen of a disease which on inoculation ( or injection ) into a healthy person, provides temporary/permanent active immunity by inducing antibodies formation. (ii) Immunisation is the process by which the body produces antibodies against the vaccine preventable diseases through administration of specific vaccines. (ii) Immunisation is the process by which the body produces antibodies against the vaccine preventable diseases through administration of specific vaccines.

Assertion : Principle of vaccination is based on the property of 'memory' of the immune system. Reason : In vaccination a preparation of antigenic protein of pathogens or inactivated/ weakened pathogen are introduced into the body.