Pandemic news from around the world.
From a man with green urine to a teenager with a sewing pin in his heart, a number of intriguing medical cases caught our eye this year.
The variant has a mutation that may make the virus "sticker" or allow it to bind more tightly to human cells.
Pigs that have been genetically engineered to be free of a molecule that triggers meat allergies have been approved by the Food and Drug Administration (FDA).
Overall, the vaccine was 52% effective after the first dose and 95% effective after the second dose.
Researchers studied blood samples from December 2019, and found a small number tested positive for antibodies against the virus.
Japan was scheduled to host the Olympic Games in the summer of 2020, but the coronavirus pandemic forced officials to postpone the competition until 2021.