How to get the smell of Blood/Vomit out of the carpet?

Hi Im hoping you can help me. Im trying to clean a carpet that has a very large amount of Blood/Vomit on it. Ive got the stain out and it looks back to normal now but the smell is appalling! Ive tried Bicarbonate of soda,Dettol,Zafflora,Wash powder,Ariel stain remover and carpet shampoo. Has anyone any other ideas? It smells like rotting meat. Thanks in advance.