Nation Booster shots 90% effective at preventing omicron hospitalizations, CDC data shows: COVID-19 updates January 21, 2022January 21, 2022 Cady Stanton, Celina Tebor and Christine Fernando, USA TODAY Comments 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.