Next. we will be back with more local news at 5:00. we are streaming on cbsn bay captioning sponsored by cbs o donnell: tonight, the big news from pfizer, why the company says the standard two-dose reg men may not be enough to protect against the new omicron variant. covid cases spike in the u.s., but there s good news tonight: the number of americans getting vaccinated is on the rise. but does the new strain mean you ll need a fourth dose sooner than expected? plus, we re in south africa, where scientists say omicron may not be as dangerous as the delta variant. former officer on trial: opening statements today for the minnesota police woman who claimed she mistakenly drew her gun instead of her taser, killing 20-year-old duante wright. instagram in the hot seat: senators grill the app s c.e.o. as concern grows that the social media giant isn t doing enough