You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Skin test useful in Hydatid disease is? and explain in detail?
ANSWER: (A) Casoni's testREF: Paniker's 6th ed p. 149The Casoni test is a skin test used in the diagnosis of hydatid disease. The test involves the intradermal injection of 0.5 ml of sterilised fluid from hydatid cysts. A wheal response occurring at the injection site within 20 minutes is considered positive. The test is positive in about 90% of cases of hydatid disease affecting the liver, but positive in less than 50% of patients with hydatid disease elsewhere in the body; false positive results are also common. Consequently, serological tests are nowr generally used.Dick's test: Scarlet fever Schick's test: Diphtheria