<prompt> Positive Schicks test indicates that person is:Immune to diphtheriaHypersensitive to diptheriaSusceptible to diphtheriaCarrier of diptheria  <response>: Positive Schicks test indicates that person is Susceptible to diphtheria. Schick test: Toxin-antitoxin neutralization test. Done on the people before staing immunization to identify susceptible individuals. Susceptible individuals develop erythema and induration on test arm following intradermal inoculation 0.2ml ID MLD of toxin. Vaccine is administered only to those susceptible people. Since now safer toxoid preparations are available, it is obsolete. 