Historical review -- The Quest for causality -- Tumors linked to infections: some general aspects -- Herpesviruses and oncogenesis -- Papillomavirus infections: a major cause of human cancers -- Hepadnaviruses -- Flaviviruses -- Retrovirus family -- Other virus infections possibly involved in human cancers -- Helicobacter, chronic inflammation, and cancer -- Parasites and human cancers -- Cancers with a possible infectious etiology
