Japan recommends people receive a different shot for their third doses to the one they received in the initial rollout, but what's the rationale behind that strategy?
Experts say the omicron variant could accelerate the pandemic’s transition toward becoming a disease that the world can manage more easily and learn to live with.
By repurposing the vector used in the long-proven smallpox vaccine, Michinori Kohara hopes to offer more enduring COVID-19 protection against variants that have yet to develop.