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What are individually wrapped sterile unmediated wound dressing used for...
A sterile dressing.
a sterile dressing
a dressing is moist at wound site and a dry dressing in covering it
To prevent infection.
A "sterile" dressing is free of germs prior to use.
dry sterile dressing
Dressing and Bandage
You want sterile dressing for open wounds. If you put a dirty dressing on an open wound, you are increasing the likelihood for infections and diseases. But if all that you have is a ripped t-shirt to put on a wound, that is definitely better than nothing at all.
Only dressings in sealed packages labeled as being sterile are sterile (free of all microbes) until opened & contaminated by being in contact with anything that is not sterile. These are available at almost any pharmacy or drugstore. Nothing that is not labeled as sterile can be considered free of germs. Never breathe over or allow anything to touch the side of a sterile dressing which will touch the wound.