Pfizer is enrolling healthy adults to test a reformulated COVID-19 vaccine that matches the hugely contagious omicron variant, to see how it compares with the original shots. COVID-19 vaccine-makers have been updating their shots to better match omicron in case global health authorities decide the change is needed. Researchers will examine the tweaked vaccine’s safety and how it revs up the immune system in comparison to the original shots. Another 600 who have already gotten three regular doses of the Pfizer vaccine will be given a fourth dose of either the regular vaccine or the omicron-matched version. Pfizer plans to produce 4 billion vaccine doses in 2022, and said Tuesday the amount isn’t expected to change if an omicron-adapted version is needed.

Source: Forbes January 25, 2022 23:26 UTC