After much fanfare about its launch, the vaccine trial for COVID-19 in Palm Beach County is on pause because of "political pressure" in an election year, its principal investigator says. Researchers said Aug. 17 that they had received the vaccine and were ready to administer it to the first 10 test subjects. But the trial’s chief investigator, infectious disease specialist Dr. Larry Bush, confirmed to The Palm Beach Post on Thursday that the trial is on pause because of a question by the Food and Drug Administration on whether a European trial is good enough to start manufacturing and distributing the vaccine. The FDA usually approves a vaccine using results only from U.S. trials — not those conducted in other countries.