What bacteria are found in both severe and small cases of cancer?

Question: What bacteria are found in both severe and small cases of cancer?
- Keywords:
  bacteria,
  cancer
Asked by 889dagg46 to Dawn on 9 Nov 2016.
- Dawn Gillies answered on 9 Nov 2016:
  
  There are some bacteria which have been linked to certain cancers (https://en.wikipedia.org/wiki/Cancer_bacteria) but unfortunately this is not my area of expertise – this is definitely something a biologist would know more about. Sorry I can’t be of more help!

Question: What bacteria are found in both severe and small cases of cancer?