Diagnosis of scarlet fever is usually based on a medical history, an examination of the throat, and a rapid strep test or throat culture to test for strep bacteria.
During the first few days of the rash development and rapid generalization, the Pastia's Lines and strawberry tongue are also present.
About 60% of circulating strains of the group A streptococcus that cause scarlet fever in Hong Kong are resistant to macrolide , says Professor , head of 's department.
The Dick test consisted of injecting a diluted strain of the streptococci known to cause scarlet fever into a person's skin.
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The rash is red and feels like and the tongue may be red and bumpy.