A footpad weight assay method to evaluate delayed-type hypersensitivity in the mouse

Delayed-type hypersensitivity lesions have been difficult to evaluate objectively in the mouse. They are usually evaluated by measurement of footpad swelling or increased ear thickness after challenge with antigen. I have developed a footpad weight assay method which reduces the observer's error and the instrumental error. This method is reliable for the assessment of delayed-type hypersensitivity reactions when results are expressed as weight increase or weight ratio calculated on challenged and unchallenged footpad.