. "\"Any process that stops, prevents, or reduces the rate of type IV hypersensitivity, a type of inflammatory response.\" [GOC:add, ISBN:0781735149]" . . "negative regulation of type IV hypersensitivity" . "down regulation of type IV hypersensitivity" . "down-regulation of type IV hypersensitivity" . "downregulation of type IV hypersensitivity" . . . . "inhibition of type IV hypersensitivity" .