How to Say "infected" in Spanish
The Spanish word for “infected” is “infectado” — A2 level. This is a very common word in everyday Spanish.

Examples
Limpia bien la herida para que no se quede infectada.
Clean the wound well so it doesn't stay infected.
Mi ordenador está infectado con un virus muy raro.
My computer is infected with a very strange virus.
El agua del río parece estar infectada por residuos químicos.
The river water seems to be contaminated by chemical waste.
Using 'Estar' for States
Use the verb 'estar' (to be) with this word because it describes a temporary condition or state of health.
Matching the Person or Thing
Remember to change the ending to match what you are describing: 'infectado' for a boy/man, 'infectada' for a girl/woman, and 'infectados/as' for groups.
The 'Ser' Trap
Mistake: “Soy infectado.”
Correction: Estoy infectado. Use 'estar' because being infected is a condition that can change, not a permanent personality trait.
Related Translations
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