The new agreement was made possible because a third manufacturer, Merz Pharma, relinquished the production capacity it had reserved with IDT for the second quarter.
IDT produces vaccines for several pharmaceutical companies. In March, the company announced that for three months it would make the single-dose Covid-19 shot developed by Johnson & Johnson.
The AstraZeneca vaccine is restricted to people over 60 in Germany due to concerns over rare blood clots in some recipients. Among those who received it recently are German Chancellor Angela Merkel and President Frank-Walter Steinmeier.