SANTA CLARA -- Tight end Vernon Davis has gained clearance from an independent neurologist and the 49ers' team physician and resumed non-contact football activity Thursday after sustaining a concussion.
The next step for Davis to receive clearance to play Sunday against the Arizona Cardinals is to remain symptom-free after non-contact football work. Davis took part in limited practice Thursday afternoon, according to the 49ers' official practice participation report.
Team physician Dr. Dan Garza, a leading researcher on concussions at Stanford, and an independent neurologist earlier this week cleared Davis resume physical activity, as part of the NFL's protocol on concussions, the team said. Davis did not practice Wednesday, but returned to on-field work Thursday.
The final step -- contact simulation -- can occur at any point before Sunday's game. The 49ers typically perform the contact simulation test a day or two before the game.
Davis sustained a concussion in the first quarter Sunday night of the 49ers' 42-13 loss on Seattle Seahawks safety Kam Chancellor big hit at the sideline while breaking up a pass. Chancellor was penalized for unnecessary roughness.
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Here are the 49ers and Cardinals practice participation reports for Thursday:
Out: WR Mario Manningham (out for season with torn knee ligaments)
Did not participate: C Jonathan Goodwin (illness), DT Justin Smith (elbow)
Limited participation: LB Ahmad Brooks (shoulder), CB Tarell Brown (shoulder, knee), TE Vernon Davis (concussion), LB Tavares Gooden (illness, rib), LB Clark Haggans (shoulder), RB Bruce Miller (shoulder), CB Carlos Rogers (knee, toe), LB Aldon Smith (shoulder), DT Will Tukuafu (neck)
Full participation: LB Navorro Bowman (wrist, shoulder), RB Frank Gore (knee), G Mike Iupati (shoulder), P Andy Lee (illness), S Trenton Robinson (finger), S Donte Whitner (knee)
Did not participate: WR Laron Byrd (knee), WR Early Doucet (concussion), T Nate Potter (ankle), S Kerry Rhodes (illness), RB Anthony Sherman (knee)
Limited participation: G Mike Gibson (calf), DE Ronald Talley (ankle), S Adrian Wilson (illness)
Full participation: S Rashad Johnson (hamstring), S James Sanders (calf), CB Gregory Toler (hamstring), DT Dan Williams (hamstring)