Pfizer begins testing omicron-matched COVID shots
A pharmacist prepares a children's dose of the Pfizer COVID-19 vaccine during a vaccination clinic at City of Lawrence's "The Center," Dec. 29, 2021, in Lawrence, Mass. AP Pfizer i…
A pharmacist prepares a children's dose of the Pfizer COVID-19 vaccine during a vaccination clinic at City of Lawrence's "The Center," Dec. 29, 2021, in Lawrence, Mass. AP Pfizer i…