c coren. this is cnn newsroom. why the suggested quarantine period has been slashed in half. a 14-year-old girl killed by police while shopping for a birthday dress. the moments that led up to the heartbreaking shooting. and christmas with covid. how some kept the holiday cheer alive despite testing positive . despite a surge of covid cases in the u.s., the centers for disease control is issuing new guidelines to shorten the isolation time for people who test positive for the virus. the cdc now recommends people can stop isolating after five days rather than ten. if they don t have symptoms and they wear a mask for another five days. experts say transmission usually happens early in the course of the illness, a day or two prior to symptoms and two to three days after. the number of children admitted to hospitals with covid is up 35% in just the past week. new york city has seen a five-fold increase this month. meanwhile, sickouts from covid have forced airlines to cance