A health-care worker administers a dose of Sinovac's COVID-19 vaccine at a drive-thru vaccination centre in Santiago, Chile, on Friday. He said that 1.5 million doses from Serum will arrive in "the coming months." What is known is that at least 26.4 million more doses — 23 million from Moderna and Pfizer combined, 1.5 million AstraZeneca doses from the Serum Institute and another 1.9 million AstraZeneca doses from COVAX, the global vaccine-sharing initiative — will arrive between April and June. The supply will grow once delivery schedules for the AstraZeneca doses are confirmed. The protein targeted by most COVID-19 vaccines, including AstraZeneca's, is called the spike protein or S-protein.

Source: CBC News February 26, 2021 21:00 UTC