The Dick Test is used to determine susceptibility to __________.

The Dick Test is a historical diagnostic test specifically designed to determine susceptibility to scarlet fever. This test involved the intradermal injection of a toxic extract from the bacteria responsible for scarlet fever, Streptococcus pyogenes. If the individual had previously been exposed to the bacteria or had immunity, they would not exhibit a reaction. Conversely, a positive reaction indicated susceptibility. While the other diseases listed have their own diagnostic assessments, they are not identified or assessed using the Dick Test. As such, this test holds significance primarily in the context of scarlet fever and was used to identify individuals at risk for the disease.