The term type iv allergic reaction is identified in base64 scheme by the sequence dHlwZSBpdiBhbGxlcmdpYyByZWFjdGlvbg==, while the MD5 signature is equal to 957da3c016a8d3d87f41f084e1534a1f. The ASCII encoding of type iv allergic reaction in hexadecimal notation is 7479706520697620616c6c6572676963207265616374696f6e.