Scraping oneself on a contaminated object may cause infection.
Contact with infected blood, contaminated needles.
Scraping oneself on an infected needle may cause infection.
Getting scraped with what can give oneself an infection?

A. deoxyribonucleic acid
B. a knife with sanitized dirt
C. Roundworms.
D. harmful substances
E. Roundworms
F. a clean needle
G. a clean scapel
H. an infected needle