habían contaminado
Past perfect ellos/ellas/ustedes conjugation of contaminar.

contaminar

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Era un caso severo en el cual se habían contaminado los interiores del tímpano entero con bacterias, pus, y presión en el oído medio.
It was a severe case in which the interiors of the entire eardrum had become contaminated with bacteria, pus, and pressure in the middle ear.
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