Perhaps you should try some spelling variations:
negative infection » negative affection (Expand search), negative selection (Expand search), negative interactions (Expand search)
decrease processes » disease processes (Expand search), decay processes (Expand search), increase process (Expand search)
infection decrease » infection decreases (Expand search), infection increase (Expand search), infection increases (Expand search)
decrease decrease » decrease release (Expand search), disease decreases (Expand search), decreases disease (Expand search)
decrease after » increase after (Expand search), disease after (Expand search)
decrease and » decreases and (Expand search), decrease in (Expand search), decrease of (Expand search)
and decrease » and decreases (Expand search), and decreased (Expand search), and increase (Expand search)

You may be able to get more results by adjusting your search query.

• Removing quotes may allow a broader search: (( decrease and decrease decrease processes ) OR ( negative infection decrease decrease after ))~.