Dr. Santiago Melón, head of the Virology Section of the HUCA Microbiology Laboratory and a specialist in Clinical Microbiology and Parasitology, began working with HIV in 1988, as the focus of his doctoral thesis and a Postdoctoral stay at the University of Minnesota. In the 1990s he completed his training in Microbiology at the former Hospital Ntra. Sra de Covadonga (today HUCA) and continued to be associated with the Virology section. His training in biology allowed him to adapt and develop molecular methods for the diagnosis of all types of viruses. His work focuses on the diagnosis and monitoring of any virus with clinical importance, applying all possible strategies: from classical cell cultures to the most innovative molecular biology techniques. In his long professional life, he has contributed to the scientific knowledge on the subject with numerous publications, communications at conferences, talks, courses, etc. He himself has supervised a dozen doctoral theses.