This is the 17254th most frequent Polish word.
zakażone
"Zakażone" means "infected" in English.
Here, 'zakażona' is used as an adjective to describe the wound being infected by bacteria or germs.
Rana na jej ręce była zakażona.
The wound on her hand was infected.
In this case, 'zakażone' acts as a plural nominative adjective describing the state of specific regions or areas.
Zakażone obszary powinny być odpowiednio oczyszczone.
Infected areas should be properly cleaned.
Here, 'zakażonej' is a feminine singular genitive adjective describing the water as being polluted or contaminated with harmful substances.