Dick test

Dick test is to use the streptococci to infect the body to produce specific antibodies (anti-erythropotoxin antibody). Once the antibody is produced, it has immunity. At this time, if the rash is injected subcutaneously, the principle of rash will no longer occur. An experiment. Therefore, the subject's immunity to streptococcus can be understood by using a local reaction after subcutaneous injection of erythrotoxin. Basic Information Specialist classification: Infectious disease examination and classification: immunological examination Applicable gender: whether men and women apply fasting: not fasting Analysis results: Below normal: Normal value: no Above normal: negative: A negative indicates that the subject has produced antibodies to the toxin and is immune. Positive: Positive indicates that the subject is not immune to the toxin, and there is no corresponding antibody in the body. For example, Streptococcus infection may suffer from scarlet fever. Tips: Keep your skin clean before checking. When inspecting, it is required to avoid friction in the injection part and not to pinch. Normal value 1. The test arm showed erythema with a diameter >10 mm, and the control side was absent, which was positive for the test. 2. There was no erythema in the injection site of the two arms, or the erythema was 5 mm in diameter, which was negative for the test. 3. Both sides of the skin appear erythema of the same size, which is a false positive, a non-specific allergic reaction. Clinical significance Check if the patient is immune to streptococcal rash toxin. 1. Positive indicates that the subject is not immune to the toxin, there is no corresponding antibody in the body, such as Streptococcus infection may suffer from scarlet fever. 2. Negative indicates that the subject has produced antibodies to the toxin and is immune. For example, streptococci are no longer suffering from scarlet fever, but may suffer from other streptococcal infectious diseases such as tonsillitis and erysipelas, because the patient is only immune to the rash of toxins of streptococcus, and is not necessarily immune to other components of streptococcus. . Abnormal results may be caused by scarlet fever, tonsillitis, erysipelas, etc. The population to be examined is not sure if they are immune to streptococcal rash toxin. Precautions Inappropriate people: patients with localized infections, ulcers or other skin diseases on the forearm. Contraindications before check-up: Pay attention to eating habits and keep your skin clean. Requirements for inspection: Partially avoid friction in the injection, do not grab the pinch. Inspection process 1. Intradermal injection of 0.1 ml Streptococcus scarlet fever red rash toxin in the forearm flexor. 2. The same amount of heated erythrodic toxin (96 ° C, 4 h) was injected intradermally on the other side of the forearm as a control. 3. After 24 hours, observe the skin reaction at the injection site. Not suitable for the crowd Forearm skin infections, ulcers or other skin diseases. Adverse reactions and risks There are no related complications and hazards.