had been sickening
Past perfect progressive conjugation of sicken.

sicken

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About a week later, Walker's son tested positive for a superbug that had been sickening infants in the unit since August.
Una semana después, al recién nacido se le detectó una superbacteria que se había propagado a bebés en esa unidad desde agosto del pasado año (Fotografía de Denise Hurdle).
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