Tight end Vernon Davis is out for the 49ers for the rest of their game Sunday against visiting Carolina with a concussion. He left in the second quarter with one catch for 2 yards. Source: CBS Sports SteveRobWhatever's Take: Tough loss for the 'Niners here. The offense has been stagnant today going up against a stout Panthers defense. The 49ers are in a dogfight today, and missing a player of Davis' caliber is going to be tough to overcome.