Peter Biggs conducted important work on fowl leukosis viruses and Marek's disease. With Jim Payne, Peter was one of the first to establish a genetic basis for the susceptibility of fowls to leukosis and sarcoma viruses. Their work in this area contributed to the development of leukosis-free chicken flocks used for experimental studies and for the production of virus-free vaccines, free of potentially oncogenic adventitious agents.

His other important contributions were in the study of Marek's disease. With colleagues, he clearly established the aetiological role of a herpesvirus in this disease, providing for the first time unequivocal evidence of the oncogenic potential of this group of viruses. He also elucidated several aspects of the pathogenicity and epizootiology of Marek's disease and led a group that was responsible for the development of effective means of controlling this disease by vaccination, producing the first effective vaccine against a neoplastic disease.

He has been awarded honorary degrees from the Ludwig-Maximilians-University Munich and the University of Liège, as well as the Wolf Prize in Agriculture.

Professor Peter Biggs CBE FMedSci FRS died on 27 December 2021.