A Yale School of Medicine doctor says while the new Moderna COVID-19 vaccine findings are a public health success story - he is concerned about when the vaccine will be available in Connecticut.

Moderna said Monday that its vaccine boasts a 94.5% success rate. Out of the 15,000 that received the shot in the Moderna study, five became sick.

Dr. Albert Ko, who is on the scientific sub-committee of Gov. Ned Lamont's task force, says the Pfizer and Moderna vaccine have a lot of similarities, but an advantage of the Moderna vaccine is that it can be stored in a fairly normal freezer.

He says there is still a long road ahead for the public to have this vaccine, and that Moderna plans to have 20 million doses by the end of December.

Moderna does not have labs in Connecticut, and Ko says no Connecticut residents participated in the Moderna trial. He says that after safety being a top concern, next is making sure pharmaceutical companies make enough of the vaccine.

"I don't think we have anything to worry about that we won't have necessary access, the question is is that we’re not going to have enough vaccine in the beginning for everyone; who are the priority groups?" he says.

Both Pfizer and Moderna vaccines could get emergency use authorization before the end of the year.