Retagged question are about (possible) infections. If these tags are really the same, shouldn't they be made synonyms? If they are not, why was Consequences of infection in a beer? edited?
Beer cannot become infected, only living organisms can become infected. Beer becomes contaminated with a biological entity.
The yeast in your beer/cider/wine could become infected, with a virus; but your beer can never become infected only contaminated.
Strictly speaking we should not have an infection tag, and only have the contamination tag.