Elizabeth Weise, USA TODAY Published 8:41 p.m. ET Aug. 14, 2020 CLOSE Approving a vaccine in the U.S. usually takes years, but COVID-19 vaccines are moving through in record time. What does that mean? USA TODAYThe U.S. government has chosen medical supplier McKesson to be a centralized distributor for future COVID-19 vaccines, a crucial step in creating a pipeline to get any eventual vaccines into American arms and stop the pandemic.“Today’s announcement puts another building block in place as the nation moves toward a safe and effective COVID-19 vaccine,” CDC director Dr. Robert Redfield said in a statement.  President Donald Trump announced the collaboration Friday, saying the United States had three vaccine candidates in Phase 3 clinical trials.”We’re ready logistically to distribute them, our military is ready,” Trump said. Distribution is a key component to getting a vaccine to as many Americans as possible as quickly as possible, once one or more become available.Several of the current candidate vaccines must be kept at extremely low temperatures — as much as -112 degrees Fahrenheit. That temperature requirement will add to the complexity of distribution. “In terms of infrastructure, we need as much cold chain equipment and ultrafreezers as we can lay our hands on,” said Prashant Yadav,

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