Nat Herz

One of the biggest challenges for distributing the COVID-19 vaccine from drug companies Pfizer and BioNTech is keeping it cold.

But Dr. Ellen Hodges, contending with subzero temperatures on a remote Southwest Alaska airport tarmac last month, had the opposite problem as she prepared to vaccinate front-line health care workers.

"It became immediately apparent that the vaccine was going to freeze in the metal part of the needle," she said. "It was just kind of wild."