Infection requires three main elements; a source, a mode of transmission, and a host. In this case since you are addressing practice that may lead to spread of infection, we'll focus on practices that transmit.
Three modes of transmission are airborne, droplet, and contact.
Therefore, IFYOU DO NOT FOLLOW standard precautions, infection will most likely spread. Here are 10 examples of standard precautions.
1)good hand hygiene, before and after every contact episode
2) use of personal protective equipment when protocol requires
3) safe use and disposal of sharps (needles, vials etc.)
4) routine environmental cleaning with antibacterial solutions & sprays
5) autoclave or otherwise reprocess appropriately any reusable medical equipment and instruments
6) good respiratory hygiene and cough etiquette (cover mouth during cough or sneeze, then wash hands)
7) aseptic non-touch technique (gloves)
8) handle waste effectively
9) handle linen appropriately
10) do not wear medical work attire at home; isolate and wash it separately and as soon as possible
Source Me/RN been doing this 100 years+++