Article Source: National Cancer Institute / 2019
Certain infectious agents, including viruses, bacteria, and parasites, can cause cancer or increase the risk that cancer will form. Some viruses can disrupt signaling that normally keeps cell growth and proliferation in check. Also, some infections weaken the immune system, making the body less able to fight off other cancer-causing infections. And some viruses, bacteria, and parasites also cause chronic inflammation, which may lead to cancer.
Most of the viruses that are linked to an increased risk of cancer can be passed from one person to another through blood and/or other body fluids. As described below, you can lower your risk of infection by getting vaccinated, not having unprotected sex, and not sharing needles.
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