The incorporation of the fantastic idea of the biochemist and doctor in chemistry Kary Mullis has allowed, along with the design of primers for his protocol, to amplify part of the genome of everything that contains DNA as starting material and in the case of some viruses that contain RNA as genomic material, a previous reaction that synthesizes DNA allows it. A database completes the scene and that's it.!!! the existence of any suspected pathogen can be validated, regardless of the origin of the sample, animal or human.