How does the body make antibodies to attack a virus/bacteria it has never seen before?

Question: How does the body make antibodies to attack a virus/bacteria it has never seen before?
- Keywords:
  antibody,
  attack,
  bacteria,
  body,
  virus
Asked by GVickerstaff to Carmen, Daniel, Laura, Noel, Steph on 11 Mar 2015.
- Noel Carter answered on 11 Mar 2015:
  
  There are special immune cells that patrol the body and check for anything it doesn’t recognise as “self”. When it come across something that is “foreign” like a bacteria it kills it. When it does this it takes bits of the bacteria and is to make antibodies that recognise the “foreign” bacteria.

GVickerstaff commented on 17 Mar 2015:

Very interesting! Thank you

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Question: How does the body make antibodies to attack a virus/bacteria it has never seen before?