A troubling new COVID subvariant is on the rise just in time for the holidays, officials have warned. The JN.1 subvariant – when stems of the omicron variant that surged in early 2022 – is “rapidly increasing globally,” the World Health Organization (WHO) declared Tuesday. JN.1 is now causing about 20 percent of new coronavirus infections in the US, the Centers for Disease Control and Prevention (CDC) estimated. The variant evolved from BA.2.86, a descendent of the omicron variant that made headlines over the summer when scientists worried that it might mutate beyond the capacity of vaccines and antibodies, CNN...