Experts say approved vaccines could raise drop-out concerns for later trials
Experts are concerned approved vaccines could make it harder to find trial participants for later rounds. They say trial drop-out rates could increase, too.
and last updated 2020-12-14 19:40:27-05
KANSAS CITY, Mo. â While Pfizer's Covid-19 vaccine is approved for public use, doctors say it's important to keep in mind multiple vaccines are needed to help end the pandemic as soon as possible.
Several trials are still underway for other COVID-19 vaccines. Those that begin later than others could face problems with having enough participants or participants dropping out to receive an approved vaccine when it's available to them.