What is the primary function of analgesic drugs?

What measures should be taken for the control and prevention of diseases?

Which type of diseases are limited to the individual and do not spread to other individuals?

The booster dose of the triple antigen $(DPT)$ vaccine is given to a child at the age of:

'Pathogens' are

Statement $I$: $ELISA$ works on the principle of antigen-antibody interaction.
Statement $II$: Infection by a pathogen can be detected by the presence of antigens or by detecting the antibodies synthesized against the pathogen.