1. Harvard epidemiologist shares early impression of variant as first U.S. case is identified in California

https://news.harvard.edu/gazette/story/2021/12/harvard-epidemiologist-gives-early-impression-of-omicron/

2. Vaccine reduces transmission in breakthrough cases

https://news.harvard.edu/gazette/story/2021/12/vaccinated-who-get-breakthrough-infections-less-contagious/

3. Moderna edges out Pfizer vaccine in head-to-head comparison

https://news.harvard.edu/gazette/story/2021/12/moderna-vaccine-slightly-more-effective-than-pfizer/