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Five infections account for nearly all of the 2.3 million cancer cases worldwide linked to infections in 2024, according to a new analysis. H. pylori and HPV top the list, followed by hepatitis B, Epstein-Barr virus and hepatitis C. Researchers say the findings highlight an opportunity for prevention, while experts caution that simply having one of these infections does not mean cancer will follow. Now, doctors are revealing the steps that can help reduce the risk of infection-related cancers and the symptoms that may warrant a closer look.