This is a paraphrasing task. In this task, you're given a sentence and your task is to generate another sentence which express same meaning as the input using different words.
Q: viruses containing the rta181t mutation remained susceptible to tenofovir with ec50 values 1.5-fold that of wild-type virus .
A:
viruses containing mutations of rta181t remained sensitive to tenofovir with ec50 levels equal to 1.5 times the susceptibility of the wild virus type .