Fear of new COVID-19 variant Omicron is rising. The Dow Jones Industrial Average took a nosedive after the CEO of Moderna announced that vaccines are much less effective against Omicron. New York City’s mayor is advising everyone to wear masks indoors until more is known about the threat posed by Omicron. A fleet of mobile vaccination centers is targeting public schools in a race to give children second shots. But Dr. William Schaffner says it’s too soon for most people to cancel holiday plans.