The main challenge to raising production of COVID-19 vaccines is how to quickly and effectively transfer technology, Germany"s health minister said Friday, reiterating Berlin"s opposition to a U.S. proposal to waive patent protection. "The main issue is not patent protection but production capacity," Jens Spahn told a news conference on Friday. In a jab at the Biden administration, Spahn also said: "I would be delighted if the United States shows the same willingness to export vaccines that we in Germany do."