Cornerback injuries concern 49ers for Game 2

Daily 49ers blog for NBC Bay Area website: Tramaine Brock, Chris Culliver and Jimmie Ward all went down in the season opener. The state of the cornerback corps is a concern heading into Sunday night's matchup with the Bears. http://www.nbcbayarea.com/news/sports/Niners-Secondary-a-Primary-Concern-vs-Bears-274476451.html