Why are so many people still getting cancer? The unfortunate
answer may be that they caught it from someone else. Let me back track and say
that cancer itself is not contagious. However, many cancers are originally
caused by infectious agents like viruses. How many? Catherine de
Martel and her colleagues from the International Agency for Research on Cancer,
France, estimate that around 16% of all cancers worldwide
began as infections.
Ninety-five percent of those two million new cancer cases
per year are attributable to just four types of viruses: Helicobacter pylori, hepatitis B and C viruses, and human
papillomaviruses. This is actually good news, because we have vaccines against
many of these agents. In fact, vaccination against viral cancers is probably
reflected in the data, since more affluent countries have a far lower rate of
these kinds of cancers. While only about 7% of cancers in developed countries
were caused by infection, 33% of cases in sub-Saharan Africa fell into that
category.
Cancer is considered to be non-communicable, and that’s
still largely true. Not only are the majority of cancers not caused by
infectious agents, but those that are tend to be caused by viruses that are not
that easy to catch. These are not infections you’d get from hugging someone.
Nevertheless, it’s important to recognize the role that viruses play in causing
cancer, and the role that vaccination may play in preventing cancer.
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