Campbell was slow to get up after a hit by Ahmad Brooks with 6:06 left in the third quarter, not an encouraging sign as third-string QB Josh McCown started loosening up.
Things were much less stressful on the opposite sideline, where Kaepernick chatted between series with Alex Smith — who was out of uniform and dressed in red 49ers jacket on a crisp, windy fall evening at sold-out Candlestick Park.
San Francisco featured the opportunistic, ball-hawking defense this time after the Bears came in with an NFL-leading 30 takeaways and 19 interceptions. Instead, Chicago ended up with a minus-2 turnover ratio.
NOTES: The 49ers won their fourth straight Monday Night Football game, fifth in six and seventh of 10. ... San Francisco’s 43 Monday Night Football victories match the Dallas Cowboys for the most. ... Bears WR Alshon Jeffery left with a knee injury in the second half.
Online: http://pro32.ap.org/poll and http://twitter.com/AP_NFL