STAT1 and infection: In contrast, there was only a very weak positive relationship between infection level, as measured by Spike expression, at 2 h p.i. and MX1 induction in SARS-CoV-2-infected EUPL cultures, and the induction of STAT1 and STAT2 in EUPL cultures at 2 h p.i. showed no dependence on the level of infection.