San Francisco 49ers Pro Bowl tight end Vernon Davis missed his second straight practice this week Thursday with the back injury he suffered in Sunday’s defeat of the Philadelphia Eagles, putting his availability for Sunday’s home game against the Kansas City Chiefs in doubt.

Following is the 49ers’ injury report for Thursday:

Did not participate: CB Tramaine Brock (toe), RT Anthony Davis (knee, ankle), TE Vernon Davis (back)

Limited participation: S Antoine Bethea (ankle), DE Tony Jerod-Eddie (shoulder), C Marcus Martin (knee), TE Vance McDonald (knee), S Eric Reid (hamstring)

Full participation: WR Michael Crabtree (foot), RB Frank Gore (back), P Andy Lee (right ankle), DE Justin Smith (not injury related)