Words similar to virus-free

Example sentences for: virus-free

How can you use “virus-free” in a sentence? Here are some example sentences to help you improve your vocabulary:

The set of "negative control" (1 μl of water instead of isolated DNA), "negative isolation control" (virus-free blood sample) and "inhibition controls" (1 μl of each isolate added in the reaction with 1 μl of positive control DNA) as well as the "positive control" (only with 1 μl of positive control DNA = recombinatnt plasmids with inserted amplicons) was additionaly amplified to reduce the risk of false positive and/or false negative results.
After exposure to viral supernatant for 24 hours, the medium was replaced with fresh, virus-free medium and the cells were cultured for an additional 48 hours.