Re ENTA: can you, or someone, provide some explanation or references to help translate this from the press release:
"...provided plasma drug levels that were 6-fold and 12-fold over the plasma protein adjusted EC90 for the Alpha variant and the Delta variant, respectively. "
It seems from this FDA document (https://www.fda.gov/media/71223/download) that EC90 its the effective concentration needed to inhibit viral replication by 90% but I'm not clear on how to apply that to the quoted sentence.