How do doctors test for infection?

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Tags

1. #cerebrospinal
2. #samples
3. #antibody
4. #tests
5. #person
6. #infected
7. #against
8. #other
9. #sample
10. #infection
11. #substances
12. #defend
13. #fluids
14. #system
15. #blood
16. #fluid
17. #usually
18. #produced
19. #immune
20. #antibodies