had been doubling
Past perfect progressiveconjugation ofdouble.There are other translations for this conjugation.

double

Thanks to the combined efforts of organisations around the globe, the Ebola situation today is a world away from this time last year, when the number of infections had been doubling every few weeks.
Gracias a los esfuerzos combinados de organizaciones de todo el mundo, la situación actual supone un considerable avance respecto a la de justo hace un año, cuando el número de infecciones se iba duplicando cada pocas semanas.
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