There’s new uncertainty about updated COVID-19 shots this fall after the Trump administration’s handling of a shot from Novavax

The US Food and Drug Administration has discussed with vaccine-maker Novavax the need for an additional trial of its Covid-19 vaccine as a post-approval commitment, a source familiar with the matter told CNN.

Novavax said Monday morning that the Food and Drug Administration was asking the company to run a new trial of its Covid-19 vaccine after it grants the shot full approval, saying