News Booster shots 90% effective at preventing omicron hospitalizations, CDC data shows: COVID-19 updates January 21, 2022January 21, 2022Cady Stanton and Celina Tebor, USA TODAYComments Off on Booster shots 90% effective at preventing omicron hospitalizations, CDC data shows: COVID-19 updates The CDC data found third doses were 'highly effective' at keeping people infected with omicron out of the hospital: Latest COVID-19 updates.