400981 Lecture Notes - Lecture 5: Opisthorchis Viverrini, Ultraviolet, Human Papillomavirus Infection
26 Feb 2020
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Document Summary
Worldwide approximately 18% of cancer deaths are related to infectious diseases. 25% in africa to less than 10% in the developed world. Viruses are the usual infectious agents that cause cancer but cancer bacteria and parasites may also play a role. oncoviruses (viruses that can cause cancer) include human papillomavirus, epstein-barr virus and nasopharyngeal carcinoma, kaposis sarcoma herpresvirus hepatitsi. B and hepatitis c viruses and human t-cell leukemia virus-1 (t- cell leukemias). Bacterial infection may also increase the risk of cancer. Schistosoma haematobium (squamous cell carcinoma of the bladder) and the liver flukes,opisthorchis viverrini and. Radiation exposure such as ultraviolet radiation and radioactive material is a risk factor for cancer. Many non-melanoma skin cancers are due to ultraviolet radiation, mostly from sunlight. Sources of ionizing radiation include medical imaging and radon gas. Ionizing radiation is not a particularly strong mutagen. Residential exposure to radon gas, for example, has similar cancer risks as passive smoking.
