© Reuters. FILE PHOTO: A nurse prepares a fourth dose of coronavirus disease (COVID-19) vaccine as part of a trial in Israel, at Sheba Medical Center in Ramat Gan, Israel December 27, 2021. REUTERS/Ronen Zvulun
By Julie Steenhuysen and Maayan Lubell
CHICAGO (Reuters) – Some nations are already looking to a fourth vaccine dose to help contend with a huge Omicron-driven spike in COVID-19 cases, but early signs suggest repeat vaccination may be a hard sell as beleaguered populations enter their third pandemic year.
Uptake of the first round of boosters in recent months – a third shot for most – has lagged initial vaccinations.
Disease experts say that rapidly shifting public health messaging in the face of a quickly-mutating virus has bred confusion and mistrust over the benefit of boosters.
The Omicron variant of…