Nationally the new Omicron offshoot variant, the XBB.1.5 represents 40.5% of the cases in the US by Dec. 31, according to the Centers for Disease Prevention and Control or CDC. In New England and New York it is about 75% of cases and is a rapidly rising variant in Europe also. Only 38% of persons over 65 years in the US have got the updated covid booster bivalent vaccine shot.