<prompt> In recent surveillance reports cases of diphtheria are reducing. This is due to -ChemoprophylaxisImproved standard of livingVaccinationHealth education  <response>: Ans. is c i.e., Vaccination o The reduced incidence of diphtheria in India is primarily due to the high coverage of appropriate immunization in children and to an apparent reduction in toxin-producing strains of the bacterium. 