had been sickening
Past perfect progressiveconjugation ofsicken.There are other translations for this conjugation.

sicken

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).
Other Dictionaries
Explore the meaning of sicken in our family of products.
Word of the Day
to cluck