<prompt> Skin test based on neutralization reaction isare -Casoni testLepromin testTuberculin testSchick test  <response>: Small amount 0.1 ml of diluted 150 MLD diphtheria toxin is injected intradermally into one arm of the person and a heat inactivated toxin on the other as a control. If a person does not have enough antibodies to fight it off, the skin around the injection will become red and swollen, indicating a positive result. This swelling disappears after a few days. If the person has an immunity, then little or no swelling and redness will occur, indicating a negative result. Ref: Ananthanarayan Panikers textbook of microbiology 9th edition pg:112 