Dr. Anthony Fauci, Chief Medical Advisor to the President, right, joined by U.S. President Joe Biden, center, and Vice President Kamala Harris, left, speaks on the omicron variant in the Roosevelt Room of the White House in Washington, D.C., U.S., on Monday, Nov. 29, 2021. Stock markets have rebounded as the picture emerging suggests the omicron Covid-19 strain is probably more transmissible but causes only mild illness and vaccines can be re-formulated to deal with it. Photo by Oliver Contreras/Pool/ABACAPRESS.COM