- Pfizer Shot Just 33% Effective Against Omicron Infection, But Largely Prevents Severe Disease, South Africa Study Finds https://www.forbes.com/sites/roberthart/2021/12/14/pfizer-shot-just-33-effective-against-omicron-infection-but-largely-prevents-severe-disease-south-africa-study-finds/?sh=7a30d0d65fbb 245 comments moderatepolitics