What is the primary purpose of the Schick test?

The primary purpose of the Schick test is to evaluate an individual's susceptibility to diphtheria. This test was designed to assess whether a person is at risk for developing the disease due to a lack of immunity. It involves injecting a small amount of diphtheria toxin into the skin and observing the reaction. A positive reaction indicates that the person is susceptible, as their body does not have the antibodies necessary to neutralize the toxin.

This is significant in public health and vaccination strategies, as it helps in identifying individuals who may benefit from vaccination against diphtheria. Understanding susceptibility guides healthcare providers in taking preventive measures to protect individuals and the community from the disease.