Moderna believes the second dose of its Covid-19 vaccine can be effectively administered between 21 to 42 days after the first dose, Ray Jordan, a spokesperson for the company, told CNN Friday.
Moderna declined to say whether the company could meet demand for second doses of coronavirus vaccine if the incoming Biden administration releases all vaccine at once, instead of holding back half.
In clinical trials, Moderna's vaccine was given as two doses 28 days apart. On Friday, President-elect Joe Biden’s team said his administration would release all doses of coronavirus vaccines right away, instead of holding back half to ensure second doses are given on time, as the Trump administration has been doing.
When asked if Moderna would be able to produce enough additional vaccine to get second doses administered on day 28, the company declined to directly answer.
"Moderna is not aware of changed requirements associated with the Biden plan but has affirmed its plan to deliver according to the existing government supply contracts," Jordan said. "This includes an expectation of delivering 100 million doses by the end of the first quarter and 200 million doses total by the end of the second quarter. Earlier this week, Moderna reported having already delivered 18 million doses to the US government."
The World Health Organization’s vaccine advisers said earlier Friday that the second dose of Pfizer’s vaccine could also be administered as long as 42 days – six weeks – after the first dose.