Coronavirus Vaccine Faces setback

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The first possible vaccine against coronavirus is on its way to human testing.

Just six weeks elapsed between when Chinese scientists released the sequence of the novel virus and when biotech company Moderna shipped its vaccine to the National Institute of Allergy and Infectious Disease to begin testing.

It's a record-breaking pace for vaccine development. Seveal other companies also are working to get their vaccines into clinical trials. 

But testing a vaccine for safety and efficacy will take 12 to 18 months or more, officials say. Whatever product makes it through testing will face another hurdle: manufacturing and distributing enough vaccine to meet demand in what could be a global pandemic. 

Untested tech

Moderna's vaccine is one of several candidates employing a new technology that has never been used in people. 

Every vaccine until now has contained parts of the germ in question. They alert the patient's immune system to be on the lookout for the germ.