What type of test assesses immune response to diphtheria?

The Dick test is a specific type of skin test that assesses the immune response to diphtheria by determining whether an individual has adequate immunity to the diphtheria toxin. In this test, the diphtheria toxin is injected intradermally, and a local reaction is observed. A positive reaction, indicated by redness and swelling, suggests that the person has been previously exposed to the diphtheria toxin and has developed an immune response, which implies that the individual is immune to diphtheria.

This method helps in evaluating vaccination effectiveness and potential susceptibility to diphtheria in individuals. The other tests listed do not serve the same purpose in assessing immune response specifically related to diphtheria. For instance, the Wasserman test is related to syphilis, while blood tests measure various components of the blood but would not assess the local immune response to diphtheria specifically.